<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>collink</title> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <meta name="author" content="Graeme Gill"> </head> <body> <h2><b>link/collink</b></h2> <h3>Summary</h3> Link two ICC device profiles to create an ICC device link profile.<br> <br> <b> collink</b> takes two device ICC profiles, and links them together, either in a simple fashion using the standard ICC forward and reverse tables of the specified intent, or using color appearance space and true gamut mapping, together with possibly inverting the forward profile, to allow black ink regeneration or to retain the input black characteristic from the input profile.<br> <h3>Usage Summary</h3> <small><span style="font-family: monospace;">collink [-options] <span style="font-style: italic;">inprofile outprofile linkedprofile</span></span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#v">-v</a><span style="font-family: monospace;"> Verbose<br> </span></small><small><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#A">-A "manufacturer"</a><span style="font-family: monospace;"> Set the manufacturer description string</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#M">-M "model"</a><span style="font-family: monospace;"> Set the model description string</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#D">-D "description"</a><span style="font-family: monospace;"> Set the profile Description string (Default "</span><span style="font-style: italic; font-family: monospace;">inoutfile</span><span style="font-family: monospace;">")</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#C">-C "copyright"</a><span style="font-family: monospace;"> Set the copyright string</span></small><br style="font-family: monospace;"> <small><span style="font-family: monospace;"></span><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#V">-V</a><span style="font-family: monospace;"> Verify existing profile, rather than link (Debug option)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#q">-q lmhu</a><span style="font-family: monospace;"> Quality - Low, Medium (def), High, Ultra</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#r">-r <i>res</i></a><span style="font-family: monospace;"> Override clut res. set by -q</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#n">-n</a><span style="font-family: monospace;"> Don't preserve device curves in result</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#f">-f</a><span style="font-family: monospace;"> Special :- Force neutral colors to be K only output.<br> </span></small><small><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="collink.html#fk">-fk</a><span style="font-family: monospace;"> Special :- Force K only neutral colors to be K only output</span></small><br style="font-family: monospace;"> <small><span style="font-family: monospace;"></span><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#F">-F</a><span style="font-family: monospace;"> Special :- Force all colors to be K only output.</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#p">-p aprof.icm</a><span style="font-family: monospace;"> Include abstract profile in link</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#s">-s</a><span style="font-family: monospace;"> Simple Mode (default)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#g">-g [src.gam]</a><span style="font-family: monospace;"> Gamut Mapping Mode [optional source image gamut]</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#G">-G [src.gam]</a><span style="font-family: monospace;"> Gamut Mapping Mode using inverse outprofile A2B [optional source gamut]</span><br style="font-family: monospace;"> <br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><u style="font-family: monospace;">Simple Mode Options:</u><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#si">-i <i>in_intent</i></a><span style="font-family: monospace;"> p = perceptual, r = relative colorimetric,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> s = saturation, a = absolute colorimetric</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#so">-o </a><i style="font-family: monospace;"><a href="#so">out_intent</a> </i><span style="font-family: monospace;"> p = perceptual, r = relative colorimetric,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> s = saturation, a = absolute colorimetric</span><br style="font-family: monospace;"> <br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><u style="font-family: monospace;">Mapping Mode Options:</u><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#i">-i <i>intent</i></a><span style="font-family: monospace;"> set linking intent from the following choice:</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> a - Absolute Colorimetric (in Jab) [ICC Absolute Colorimetric]<br> aw - Absolute Colorimetric (in Jab) with scaling to fit white point<br style="font-family: monospace;"> </span><span style="font-family: monospace;"> aa - Absolute Appearance</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> r - White Point Matched Appearance [ICC Relative Colorimetric]</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> la - Luminance matched Appearance</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> p - Perceptual (Preferred) [ICC Perceptual]</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> ms - Saturation</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> s - Enhanced Saturation [ICC Saturation]</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> al - Absolute Colorimetric (Lab)</span><span style="font-family: monospace;"></span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#w">-w [J,a,b]</a><span style="font-family: monospace;"> Use forced whitepoint hack [optional color to map the white to]</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#c">-c <i>viewcond</i></a><span style="font-family: monospace;"> set input viewing conditions for CIECAM02,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> either an enumerated choice, or a parameter</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#d">-d <i>viewcond</i></a><span style="font-family: monospace;"> set output viewing conditions for CIECAM02,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> either an enumerated choice, or a parameter:value change</span><span style="font-family: monospace;"></span><br style="font-family: monospace;"> <span style="font-family: monospace;"> pp - Practical Reflection Print</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> pe - Print evaluation environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> mt - Monitor in typical work environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> mb - Monitor in bright work environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> md - Monitor in darkened work environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> jm - Projector in dim environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> jd - Projector in dark environment</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> pcd - Photo CD - original scene outdoors</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> ob - Original scene - Bright Outdoors</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> cx - Cut Sheet Transparencies on a viewing box</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> s:surround a = average, m = dim, d = dark,</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> c = transparency (default average)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> w:X:Y:Z Adapted white point as XYZ (default media white)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> w:x:y Adapted white point as x, y</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> a:adaptation Adaptatation luminance in cd.m^2 (default 50.0)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> b:background Background % of image luminance (default 20)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> f:flare Flare light % of image luminance (default 1)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> f:X:Y:Z Flare color as XYZ (default media white)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> f:x:y Flare color as x, y</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="collink.html#t">-t <i>tlimit</i></a><span style="font-family: monospace;"> set input total ink limit, 0 - 400% (estimate by default)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="collink.html#T">-T <i>klimit</i></a><span style="font-family: monospace;"> set input total ink limit, 0 - 100% (estimate by default)</span><br style="font-family: monospace;"> <br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><u style="font-family: monospace;">Inverse outprofile A2B Options:</u><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#k">-k tezhxr</a><span style="font-family: monospace;"> CMYK Black generation</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> t = transfer K from input to output, e = retain K of output B2A table</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> z = zero K, h = 0.5 K, x = maximum K, r = ramp K (default)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#kp">-k p stle stpo enpo enle shape</a><br style="font-family: monospace;"> <span style="font-family: monospace;"> p = black level generation curve parameters</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#kq">-k q stle0 stpo0 enpo0 enle0 shape0 stle2 stpo2 enpo2 enle2 shape2</a><br style="font-family: monospace;"> <span style="font-family: monospace;"> q = transfer input K to dual curve limits</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="xicclu.html#K">-K parameters</a><span style="font-family: monospace;"> Same as -k, but target is K locus rather than K value itself</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#l">-l <i>tlimit</i></a><span style="font-family: monospace;"> set output total ink limit, 0 - 400% (estimate by default)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#L">-L <i>klimit</i></a><span style="font-family: monospace;"> set output total ink limit, 0 - 100% (estimate by default)<br> </span></small> <small><span style="font-family: monospace;"><a href="colprof.html#P">-P</a> Create gamut gammap_p.wrl and gammap_s.wrl diagostics</span></small><small><br> <br> <span style="font-family: monospace;"></span></small><span style="font-family: monospace;"> </span><a href="#p1"><i style="font-family: monospace;">inprofile</i></a><span style="font-family: monospace;"> source ICC profile. A </span><small><span style="font-family: monospace;">TIFF file with embedded profile may be used here.</span></small><br style="font-family: monospace;"> <span style="font-family: monospace;"> <a href="#p2">o</a></span><a href="#p2"><i style="font-family: monospace;">utprofile</i></a><span style="font-family: monospace;"> destination ICC profile. </span><span style="font-family: monospace;">A </span><small><span style="font-family: monospace;">TIFF file with embedded profile may be used here.</span></small><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a href="#p3"><i style="font-family: monospace;">linkedprofile</i></a><span style="font-family: monospace;"> resulting device link profile</span><br> <h3>Usage Details and Discussion</h3> <b><a name="v"></a> -v</b> Turns on verbose mode. Gives progress information as the profile is created. Since gamut map mode inverse profile linking can take a long time to perform, this is often useful. <br> <br> <a name="A"></a>The <b>-A</b> parameter allows setting of the device manufacturer description tag. This parameter may not be relevant for a link profile, but if used should be a string that identifies the manufacturer of the primary device used in the link. With most command line shells, it will be necessary to enclose the parameter with double quotes, so that spaces and other special characters are included in the parameter, and not mistaken for the start of another flag, or as a final command line parameters. By default no manufacturer description string tag will be generated for the profile.<br> <br> <a name="M"></a>The <b>-M</b> parameter allows setting of the device mode description tag. This parameter may not be relevant for a link profile, but if used should be a string that identifies the particular model of primary device used in the link. With most command line shells, it will be necessary to enclose the parameter with double quotes, so that spaces and other special characters are included in the parameter, and not mistaken for the start of another flag, or as a final command line parameters. By default no model description string tag will be generated for the profile.<br> <br> <a name="D"></a>The <b>-D</b> parameter allows setting of the profile description tag. The parameter should be a string that describes the profile. On many systems, it will be this string that will be used to identify the profile from a list of possible profiles. With most command line shells, it will be necessary to enclose the parameter with double quotes, so that spaces and other special characters are included in the parameter, and not mistaken for the start of another flag, or as a final command line parameter. Many programs that deal with ICC profiles use the description tag to identify a profile, rather than the profile filename, so using a descriptive string is important in being able to find a profile. By default, the base name of the resulting profile will be used as the description.<br> <br> <a name="C"></a>The <b>-C</b> parameter allows setting of the profile copyright tag. The parameter should be a string that describes the copyright (if any) claimed on the profile being generated.. With most command line shells, it will be necessary to enclose the parameter with double quotes, so that spaces and other special characters are included in the parameter, and not mistaken for the start of another flag, or as a final command line parameters. By default a generic copyright string will be generated for the profile.<br> <br> <br> <b><a name="V"></a> -V</b> Verifies an existing profile. This is really a debugging option. It is only useful if all the linking parameters are identical to those used during the creation of the profile being verified.<br> <br> <b><a name="q"></a> -q [lmhu]</b> Quality - Low, Medium (def), High, Ultra<br> <b><a name="r"></a> -r res </b> Override clut res. set by <b>-q</b><br> <br> This sets the basic quality of the resulting link, by choosing the resolution of various tables in the resulting profile, as well as the resolution of other temporary tables used in creating the link. The <b>-r</b> flag allows overriding the resolution set by the <b>-q</b> option, for the ICC profile CLUT multi-dimensional interpolation table. It is highly recommended that <span style="font-weight: bold;">-qm</span> be used as a starting point, and other settings only tried after this has been evaluated. <span style="font-weight: bold;">-qu</span> should almost never be used, except to prove that it should almost never be used.<br> <br> Normally the per channel device curves in the input and output profiles are preserved in the resulting device link profile, but the <b>-n</b> option disables this. This can be useful if the device linearisation curves are inappropriate in nature.<br> <br> <a name="f"></a><a name="F"></a><a name="fk"></a> The <b>-f</b> option is a special purpose flag useful only for 3 or 4 component (RGB, CMY or CMYK) input to CMYK output linking, that causes the output to be K only for neutral axis input. Neutral axis input is assumed for R=G=B or C=M=Y input values. If the <span style="font-weight: bold;">-fk</span> option is used, then C=M=Y=0 are regarded as neutral colors, so that K only input will be mapped to K only output. If the <b>-F</b> flag is used, then all colors will be converted to K only output.<br> <br> <a name="p"></a> The <b>-p</b> option alows specifying an abstract profile be applied between the input and output profiles. An abstract profile is a way of specifying a color adjustment in a device independent way. The abstract profile might have been created using one of the <span style="font-weight: bold;">tweak</span> tools, such as <a href="refine.html">refine</a>.<br> <br> The basic linking style is chosen by using the <b>-s</b> (default), <b>-g</b> or <b>-G</b> flags. The three behaviors are:<br> <br> <a name="s"></a> <b>-s</b> Simple mode. No gamut mapping is performed, the selected intent AtoB and BtoA tables are simply concatenated to create the output link, with the gamut mapping behavior being determined solely by the BtoA table. The -i and -o options allow selection of the input and output ICC intents. This is typically how other CMS do ICC linking. <a href="#ss">Details</a>.<br> <br> <a name="g"></a> <b>-g</b> Gamut mapping mode. In this mode, the absolute colorimetric AtoB and BtoA tables are used to perform the link, and the intermediate linking color space is (generally) the CIECAM02 Jab appearance space. The input and output viewing conditions can be selected using the <b>-c</b> and <b>-d</b> options. A gamut mapping is performed between the two spaces, using the intent selected by the <b>-i</b> option. There is an optional argument, which is a source gamut to use instead of that of the source profile. This is to allow optimizing the gamut mapping to a source gamut of a particular image, which can give slightly better results that gamut mapping from the gamut of the source colorspace. Such a source image gamut can be created using the <a href="tiffgamut.html"> tiffgamut</a> utility. More <a href="#gg">details</a> about gamut mapping mode.<br> <br> <a name="G"></a> <b>-G</b> Use the gamut mapped, inverse AtoB table linking method. This is generally the most accurate, smooth and flexible linking method, but takes the longest to perform. The gamut mapping mode (<span style="font-weight: bold;">-g</span>) options <b>-i</b>, <b>-c</b>, <b>-d</b>, <b>-k</b> and <b>-l</b> are effective when this method is selected. There is an optional argument, which is a source gamut to use instead of that of the source profile. This is to allow optimizing the gamut mapping to a source gamut of a particular image, which can give slightly better results that gamut mapping from the gamut of the source colorspace. Such a source image gamut can be created using the <a href="tiffgamut.html"> tiffgamut</a> utility. More <a href="#GG">details</a> about the gamut mapping, inverse AtoB mode.<br> <br> The gamut provided to the <span style="font-weight: bold;">-g</span> or <span style="font-weight: bold;">-G</span> flag should be in the same colorspace that <span style="font-weight: bold;">collink</span> is using internally to connect the two profiles. For all intents except the last one (no. <span style="font-weight: bold;">7</span>), the space should be Jab appearance space, with the viewing conditions generally being those of the input profile viewing conditions. The input profile will normally be the one used to create a source image gamut using <span style="font-weight: bold;">tiffgamut</span>.<br> <br> <u><a name="ss"></a> Simple mode gamut mapping options:</u><br> <br> <a name="si"></a> <b>-i</b> <i>in_intent</i> <b>p</b> = perceptual, <b>r</b> = relative colorimetric,<br> <b>s</b> = saturation, <b>a</b> = absolute colorimetric<br> <a name="so"></a> <b>-o</b> <i>out_intent</i> <b>p</b> = perceptual, <b>r</b> = relative colorimetric,<br> <b>s</b> = saturation, <b>a</b> = absolute colorimetric<br> <br> These two options simply select the appropriate ICC table, according to desired intent. Generally, it is a good idea to use the same intent for both source and destination. Not all ICC profiles support all four intents.<br> <br> <u><a name="gg"></a> Gamut mapping mode options:</u><br> <br> <a name="i"></a> <b>-i</b> <i>intent</i><br> <br> Select the gamut mapping intent. In gamut mapping mode there is only a single overall intent. The intent is selected using the 1 two letter option parameter, the standard ICC profile being a subset of the available selections.<br> <br> <a name="ia"></a>The No.<b> </b> <span style="font-weight: bold;">a</span> intent, Absolute Colorimetric is intended to reproduce colors exactly, irrespective of the white point of the each medium. This is done using CIECAM02 Jab appearance colorspace by forcing the source and destination to have a common white point (but other aspects of the individual viewing conditions are active), and colors are mapped directly from input to output, clipping any out of gamut colors to the closest match. This is equivalent to the ICC <span style="font-weight: bold;">Absolute Colorimetric</span> intent, and is often used for proofing purposes. <br> <br> <a name="iaw"></a>The <span style="font-weight: bold;">aw</span><b style="font-weight: bold;"></b> intent, Absolute Colorimetric with scaling to fit white point, is very similar to the <span style="font-weight: bold;">a</span> intent, except that it will scale the source colorspace down in order to make sure that the source white point isn't clipped by the gamut of the destination. This might be used in some print proofing situations where the source white is lightly lighter than the destination white (as an alternative to using the <a href="#w">-w</a> flag), or it may be useful in some soft proofing situations where the differences in white point of the display destination would cause clipping of the source white point. When the <a href="#v">-v</a> flag is on, the scaling factor used will be displayed during execution.<br> <br> <a name="iaa"></a>The <span style="font-weight: bold;">aa</span> intent, Absolute Appearance, simply maps the Jab colors directly from input to output, clipping any out of gamut colors to the closest match. This attempts to match the exact appearance of colors as closely as possible, but may not exactly map the white point of the source to the destination, depending on how different the viewing conditions are.<br> <br> <a name="ir"></a>The <span style="font-weight: bold;">r</span> intent is like Absolute Appearance mode, but maps the white point from input to output precisely, and otherwise maps the Jab colors directly from input to output, clipping any out of gamut colors to the closest match. This is equivalent to the ICC <span style="font-weight: bold;">Relative Colorimetric</span> intent.<br> <br> <a name="ila"></a>The <span style="font-weight: bold;">la</span> intent, Luminance matched appearance, linearly compresses or expands the the luminance axis to match the input to the output space, while not otherwise altering the gamut, clipping any out of gamut colors to the closest match.<br> <br> <a name="ip"></a>The <span style="font-weight: bold;">p</span> intent, Perceptual, uses "knee" type 3 Dimensional compression to make the input gamut fit within the output gamut. As much as possible, clipping is avoided, hues and the overall appearance is maintained. This is equivalent to the ICC <span style="font-weight: bold;">Perceptual</span> intent.<br> <br> <a name="ims"></a>The <span style="font-weight: bold;">ms</span> intent, Saturation, uses 3 Dimensional compression and expansion to try and make the input gamut exactly match the output gamut, and also favours higher saturation over hue or lightness preservation.<br> <br> <a name="is"></a>The <span style="font-weight: bold;"></span><span style="font-weight: bold;">s</span> intent, Enhanced Saturation, uses the same basic gamut mapping as <span style="font-weight: bold;">ms</span>, Saturation, but increases saturation slightly in highly saturated areas of the gamut. This is equivalent to the ICC <span style="font-weight: bold;">Saturation</span> intent.<br> <br> <a name="ial"></a>The <span style="font-weight: bold;">al</span> intent, Absolute Appearance (Lab), is similar to intent <span style="font-weight: bold;">a</span>, but L*a*b* colorspace is used rather than CIECAM02 Jab appearance space. This often leads to poor reproduction of blue and red hues.<br> <br> <a name="w"></a> The <b>-w</b> flag forces the white points to be mapped from source to destination, irrespective of the intent chosen. This is useful if absolute intent is being used, and the two media white points should match, but don't quite due to measurement error.<br> The <b>-w</b> flag can optionally be followed by three numbers, that specify a color that white should be mapped to. This will be in the colorspace used during linking (typically Jab space, which has similar characteristics to L*a*b* space). This options can be useful in fine tuning paper emulation is absolute colorimetric mapping mode.<br> <br> <a name="c"></a><a name="d"></a> The <b>-c</b> and <b>-d</b> options allow specification of the viewing conditions for the source and destination colorspaces respectively. The viewing condition information is used to map the profile PCS (Profile Connection Space, which us either XYZ or L*a*b*) color into appearance space (CIECAM02), which is a better colorspace to do gamut mapping in. The viewing conditions allow the conversion into appearance space to take account of how color will be seen under particular viewing conditions.<br> Viewing conditions can be specified in two basic ways. One is to select from the list of "pre canned", enumerated viewing conditions, choosing one that is closest to the conditions that are appropriate for the media type and situation. Alternatively, the viewing conditions parameters can be specified in detail individually. If both methods are used, them the chosen enumerated condition will be used as a base, and its parameters will then be individually overridden.<br> <br> <a name="t"></a> The <b>-t</b> <i>tlimit</i> parameter sets the total ink limit (TAC, Total Area Coverage) for a CMYK input profile, as a total percentage from 0% to 400%. This affects the gamut assumed for the input profile. By default, a total ink limit will be estimated from the output profile tables.<br> <br> <a name="T"></a> The <b>-T</b> <i>klimit</i> parameter sets the black channel ink limit for a CMYK input profile, as a total percentage from 0% to 100%. This affects the gamut assumed for the input profile. By default, a black ink limit will be estimated from the profile tables.<br> <br> <br> <u> <a name="GG"></a>Inverse outprofile A2B Options:</u><br> <br> When the <b>-G</b> flag is used, the A2B table is inverted "on the fly", allowing various additional choices as to what device values are used to reproduce a particular color. (If the <b>-G</b> flag is not used, then such decisions are encoded in the B2A table in the profile, and cannot be altered during linking).<br> <br> <a name="k"></a> -<b>k</b> parameter sets the target level of black (K) when creating a B2A CMYK output tables. This is often called a black level, a black inking rule, black generation, or under color removal. These set the target black level:<br> <br> <b> -kz</b> selects minimum black (0.0)<br> <b> -kh</b> selects a black level value of 0.5<br> <b> -kx</b> selects the maximum possible black (1.0)<br> <b> -kr</b> selects a linear level ramp, starting at minimum black for highlight, and maximum black for shadow (equivalent to -kp 0 0 1 1 1). This is the default.<br> <b>-kt</b>, will preserve the black amount from the input (CMYK) profile to the output (CMYK) profile as much as possible. This may be most useful in creating a CMYK to CMYK conversion between two different press conditions, while preserving as much as possible the black only use for text etc. in anything converted.<br> <b>-ke</b>, will preserve the black amount from the output profile B2A table (CMYK).<br> <br> <b><a name="kp"></a>-k p stle stpo enpo enle shape</b> allows an arbitrary black locus ramp to be defined, consisting of a starting value (stle) for highlights, a breakpoint L value (stpo) where it starts to transition to the shadow level, an end breakpoint L (enpo) where it flattens out again, and the finishing black level (enle) for the shadows. There is also a curve parameter, that modifies the transition from stle to enle to either be concave (ie. the transition starts gradually and and finished more abruptly) using values 0.0-1.0, with 0.0 being most concave, or convex (the transition starts more abruptly but finishes gradually), using values 1.0-2.0, with 2.0 being the most convex.<br> <br> Typical black value generation curve with parameters something like: -kp 0 .1 .9 1 .5<br> <br> <tt> 1.0 K | enpo<br> | _______ enle<br> | /<br> | /<br> | /<br> | /<br> stle | ------/<br> +-------------------<br> 0.0 K 0.0 stpo 1.0<br> White Black<br> <br> </tt>For minimum sensitivity of printed output to the lighting spectrum, it currently seems best to use the maximum possible black, but other black generation levels (ie. 0.3 to 0.5) may well be preferred if one wants to minimize the noisy appearance of black on an inkjet device, or if the banding behaviour or other rendering flaws of the printer is to be minimized. <br> <br> <b><a name="kq"></a>-k q stle0 stpo0 enpo0 enle0 shape0 stle2 stpo2 enpo2 enle2 shape2</b> is a combination of the <b>-kt</b> and <b>-kp</b> functionality, with the black being preserved in CMYK to CMYK linking, with the output black constrained to be between the first and second set of curve parameters.<br> <br> The <a href="xicclu.html">xicclu</a> utility can be used to plot out the resulting black level for a given set of parameters, by using the <a href="xicclu.html#g">-g</a> flag of a profile already created from the same .ti3 file.<br> <br> <a name="K"></a> <span style="font-weight: bold;">-K parameters.</span> Any of the <span style="font-weight: bold;">-k</span> options above can use the <span style="font-weight: bold;">-K</span> version, in which rather than a black value target being defined by the inking rule, a black <span style="text-decoration: underline;">locus</span> target is defined. For each lookup, the minimum possible black level and the maximum possible black level is determined, the former corresponding to a locus target value of 0, and the latter corresponding to a locus target value of 1. For instance, at the white point, no black will be used in the output, even if the black locus specifies a maximum (since the maximum amount of black that can be used to print white is actually zero). Similarly, at the black point, black may well be used, even if the black locus specifies zero black (since a certain amount of black is needed to achieve the desired density of color). <br> <tt> </tt><br> <a name="l"></a> The <b>-l</b> <i>tlimit</i> parameter sets the total ink limit (TAC, Total Area Coverage) for the CMYK separation, as a total percentage from 0% to 400%. This affects the gamut assumed for the output profile, as well as the ink limit in the generated device link. The limit value should generally be set a little below the value used in the test chart generation, to avoid the very edges of the gamut. If the test chart ink limit has been chosen to be a little beyond an acceptable level, then this number should be the acceptable level. Although limits can be set below 200%, this will generally restrict the color gamut noticeably, as fully saturated secondary colors will not be reproduced. Values are between 220% and 300% for typical printing devices. By default, a total ink limit will be estimated from the output profile tables.<br> <br> <a name="L"></a> The <b>-L</b> <i>klimit</i> parameter sets the black channel ink limit for the CMYK separation, as a total percentage from 0% to 100%. This affects the gamut assumed for the output profile, as well as the ink limit in the generated device link. For printing press like devices, this can be used to prevent the black channel screening pattern "filling in". Typical values might be from 95% to 99%. By default, a black ink limit will be estimated from the profile tables.<br> <br> <b><a name="P"></a></b>The <b>-P</b> option causes a diagnostic 3D <a href="File_Formats.html#VRML">VRML</a> plots to be created that illustrate the gamut mapping generated.<br> <br> <a name="p1"></a>The <i><b>inprofile</b></i> argument specifies the source profile. This is the color space/device we are attempting to emulate in the overall conversion. A <small>TIFF file with embedded profile may be used here.</small><br> <br> <a name="p2"></a>The<i><b> outprofile</b></i> argument specifies the destination profile. This is the device we are actually displaying on or printing to. A <small>TIFF file with embedded profile may be used here.</small><br> <br> <a name="p3"></a>The <i><b>linkedprofile</b></i> argument specifies the resulting device link profile. This profile will contain the color transform from the input space to output space.<br> <br> For information on typical usage, see the <a href="Scenarios.html">Typical Usage Scenarios</a> page.<br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> </body> </html>
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Mandriva
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2010.0
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56e231b080a119bc733fcd74872c9f3d
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