<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>chartread</title> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <meta name="author" content="Graeme Gill"> </head> <body> <h2><b>spectro/chartread</b></h2> <h3>Summary</h3> Read a printer test chart using an instrument, to create a <a href="File_Formats.html#.ti3">.ti3</a> data file. The type of instrument is determined by the communication port selected.<br> <br> <span style="font-weight: bold;">chartread</span> can also be used to read transmission values, and to read display values manually.<br> <h3>Usage</h3> <small><span style="font-family: monospace;">chartread [-options] outfile</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 mode</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#c">-c listno</a><span style="font-family: monospace;"> Set communication port from the following list (default 1)</span><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#t">-t</a><span style="font-family: monospace;"> Use transmission measurement mode<br> </span></small><small><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#d">-d</a><span style="font-family: monospace;"> Use display measurement mode (white Y relative results)</span></small><small><span style="font-family: monospace;"></span></small><small><span style="font-family: monospace;"><br> </span></small><font size="-1"><span style="font-family: monospace;"> <a href="#y">-y c|l</a> Display type, c = CRT, l = LCD</span></font><br> <small><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#e">-e</a><span style="font-family: monospace;"> Use emissive measurement mode (absolute results)<br> </span></small><small><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#p">-p</a><span style="font-family: monospace;"> Measure patch by patch rather than strip</span></small><br> <small><span style="font-family: monospace;"></span> <a style="font-family: monospace;" href="#x">-x [lx]</a><span style="font-family: monospace;"> Take external values, either L*a*b* (-xl) or XYZ (-xx).</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 save spectral information (default saves spectral)<br> </span></small><small><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#l">-l</a><span style="font-family: monospace;"> Save CIE as D50 L*a*b* rather than XYZ<br> </span></small><small><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#a">-a</a><span style="font-family: monospace;"> Save patch locations to output as well</span></small><br> <font size="-1"><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#N">-N</a><span style="font-family: monospace;"> Disable auto calibration of instrument<br> </span></font><font size="-1"><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#B">-B</a><span style="font-family: monospace;"> Disable auto bi-directional strip recognition</span></font><br> <font size="-1"><span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#H">-H</a><span style="font-family: monospace;"> Use high resolution spectrum mode (if available)<br> <a href="#T">-T ratio</a> Modify strip patch consistency tollerance by ratio (if available)<br> </span></font><font size="-1"><span style="font-family: monospace;"> <a href="dispcal.html#W">-W n|h|x</a> Ovride serial port flow control: n = none, h = HW, x = Xon/Xoff</span></font><br style="font-family: monospace;"> <small><span style="font-family: monospace;"></span><small style="font-family: monospace;"> <a href="#D">-D [level]</a> Print debug diagnostics to stderr</small><br style="font-family: monospace;"> <span style="font-family: monospace;"> </span><a style="font-family: monospace;" href="#p1"><i>inoutfile</i></a><span style="font-family: monospace;"> Base name for input[</span><a style="font-family: monospace;" href="File_Formats.html#.ti2">.ti2</a><span style="font-family: monospace;">]/output[</span><a style="font-family: monospace;" href="File_Formats.html#.ti3">.ti3</a><span style="font-family: monospace;">] file</span></small> <br> <h3>Usage Details</h3> <a name="v"></a>The <b>-v</b> flag causes extra information to be printed out during chartread operation.<br> <br> <a name="c"></a>Normally instruments are connected via a serial communication port, and the port used should be selected by supplying the correct parameter to the <b>-c</b> flag. If you invoke <span style="font-weight: bold;">chartread</span> so as to display the usage information (i.e. "chartread -?" or "chartread --"), then the discovered serial ports will be listed on Windows and Mac OSX systems.<br> <br> <a name="t"></a>If using an Xrite DTP41T, and printing onto transparent or back lit media, use the <b>-t</b> flag to operate the instrument in transparency mode. If using a Spectrolino or Eye-One Pro (handheld), this triggers a fake transparency mode, that uses a separate backlight (such as a light box). The instrument will be used to calibrate the level of backlight, and use this to compute the transparency of the test chart samples. Note that for good transparency values, the backlight level needs to be neither too bright not too dark, should ideally be incandescent rather than fluorescent (since fluorescent lights often have big dips in their spectrum), and ideally should be of uniform brightness over the measurement area. If using the SpectroScanT, the <span style="font-weight: bold;">-t</span> flag operates the instrument in transparency mode, each reading being manually triggered.<br> <br> <a name="d"></a>The <span style="font-weight: bold;">-d</span> flag allows measuring in display mode using instruments that support this mode, with the brightness normalized to the white patch value in the test chart. While the brightness values are then relative to the white, the readings are otherwise absolute. This corresponds to the raw ICC absolute readings created by <a href="dispread.html">dispread</a>, and is the mode that should be used for creating a normal display ICC profile using manual, spot by spot readings. This can be useful if the display cannot be driven directly by the computer, but can be made manually to display the test charts.<br> <br> <a name="y"></a> Display type. Some colorimeters (like the DTP94 and Eye-One Display) require that the the type of display technology used be specified. Use <span style="font-weight: bold;">-yc</span> if you are calibrating a CRT (Cathode Ray Tube) type monitor, and use <span style="font-weight: bold;">-il</span> if you are calibrating an LCD (Liquid Crystal Display).<br> <br> <a name="e"></a> If using an instrument that supports an emissive measurement mode (such as the Spectrolino), then the <span style="font-weight: bold;">-e</span> flag enables this measurement mode, and the values recorded will be absolute XYZ values. This can be used for media such as backlit film, measuring it on a lightbox, so as to capture the actual illumination characteristics of that particular media.<br> <br> <a name="p"></a> The <span style="font-weight: bold;">-p</span> flag causes chartread to use a spot read mode for an instrument, even if it is capable of faster chart reading modes such as strip reading. This can be useful if strip measurement patch recognition is not reliable for certain media.<br> <br> <a name="x"></a> The <span style="font-weight: bold;">-x</span> flag causes chartread to expect values to be entered for each reading, rather than using an instrument to do the measurements. This mode is ideal if your instrument is not supported by Argyll. Either XYZ or L*a*b* values can be entered, depending on what option follows <span style="font-weight: bold;"><span style="font-weight: bold;">-l</span></span>, <span style="font-weight: bold;">-lx</span> to specify XYZ values, or <span style="font-weight: bold;">-ll</span> to specify L*a*b* values. XYZ values are expected to be scaled to a maximum of 100. It is possible to navigate about the test values being measured, so as to do them in any order, as well as re-do values, in case of any mistakes.<br> <br> <a name="n"></a> By default spectral information as well as D50 standard observer XYZ values will be recorded for each test patch, when such readings are available from a device. The spectral readings allow for choosing a non-standard viewing illuminant, a non-standard observer model, or the use of the Fluorescent Paper Whitener Additive compensation when creating the profile. If the spectral readings are not needed, then prinread operation can be speeded up by specifying the <b>-n</b> flag.<br> <br> <a name="l"></a> By default D50 standard observer XYZ values will be recorded for each test patch, but if the <span style="font-weight: bold;"><span style="font-weight: bold;">-l</span></span> flag is used, D50 L*a*b* values will be recorded instead.<br> <br> <a name="a"></a> Normally the patch locations are not needed in the output, but if a chart is being read as an input reference (for use in profiling a scanner or a camera), then the patch locations will still be needed. The <span style="font-weight: bold;">-a</span> flag adds the locations to the output .ti3 file.<br> <br> <a name="N"></a> Many instruments automatically ask for an instrument calibration before each set of readings. Sometimes this can be awkward if the instrument is being mounted in some sort of measuring jig, or annoying if several sets of readings are being taken in quick succession. The -<span style="font-weight: bold;">N</span> suppresses this automatic calibration (if possible), causing the previous calibration recorded in the instrument or on the host computer. It is advisable to only use this option on the second and subsequent measurements in a single session.<br> <br> <a name="B"></a> Some strip instruments (i.e.. Eye-One Pro) when used with Argyll will automatically recognize a strip when read in the reverse direction, by matching the patch readings against their expected values. If the expected values are not known accurately enough, this may cause erroneous reverse recognition, so the <span style="font-weight: bold;">-<span style="font-weight: bold;">B</span></span> flag allows this to be turned off, forcing strips to only be read in the forward direction.<br> <br> <a name="H"></a> The -<span style="font-weight: bold;">H</span> option turns on high resolution spectral mode, if the instrument supports it. See <a href="instruments.html">Operation of particular instruments</a> for more details.<br> <br> <a name="T"></a> The -<span style="font-weight: bold;">T ratio</span> argument modifies the patch consistency tolerance threshold for some strip reading instruments (ie. the Eye-One Pro). In recognizing patches in a strip, an instrument may take multiple readings as the strip is read, and then divide the readings up into each patch. It may then check the consistency of the multiple readings corresponding to each patch, and reject the measurement if they are too inconsistent. For some media (ie. a coarser screens, fabric etc.) the default tolerance may be unreasonably tight, so the <span style="font-weight: bold;">-T ratio</span> argument can be used to modify this criteria. To loosen the tolerance, use a number greater than 1.0 (ie. 1.5, 2.0).<br> <br> <a name="W"></a>The <b>-W</b> <span style="font-weight: bold;">n|h|x</span> parameter overrides the default serial communications flow control setting. The value <span style="font-weight: bold;">n</span> turns all flow control off, <span style="font-weight: bold;">h</span> sets hardware handshaking, and <span style="font-weight: bold;">x</span> sets Xon/Xoff handshaking. This commend may be useful in workaround serial communications issues with some systems and cables. <br> <br> <a name="D"></a>The <b>-D</b> flag causes communications and other instrument diagnostics to be printed to stdout. A level can be set between 1 .. 9, that may give progressively more verbose information, depending on the instrument. This can be useful in tracking down why an instrument can't connect.<br> <br> <a name="p1"></a> The <i>inoutfile</i> parameters should be the base name of the .ti2 file, and chartread will output an .ti3 that has the same basename and the .ti3 extension.<br> <br> <hr style="width: 50%; height: 2px;"> <h3>Discussion</h3> For information about the operation of different instruments, see <a href="instruments.html">Operation of particular instruments</a>.<br> <br> <br> </body> </html>
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