<!-- manual page source format generated by PolyglotMan v3.2, --> <!-- available at http://polyglotman.sourceforge.net/ --> <html> <head> <title>IM_THRESH(3) manual page</title> </head> <body bgcolor='white'> <a href='#toc'>Table of Contents</a><p> <h2><a name='sect0' href='#toc0'>Name</a></h2> im_thresh, im_slice - threshold an image <h2><a name='sect1' href='#toc1'>Synopsis</a></h2> #include <vips/vips.h> <p> int im_thresh(in, out, threshold) <br> IMAGE *in, *out; <br> double threshold; <p> int im_slice(in, out, threshold1, threshold2) <br> IMAGE *in, *out; <br> double threshold1, threshold2; <h2><a name='sect2' href='#toc2'>Description</a></h2> These functions have been replaced with the relational and boolean packages - see <b>im_lessconst() </b> and <b>im_and() </b> for much better ways of doing this. <p> These functions operate on any non-complex input. The output image is a unsigned char image with the same sizes and the same number of channels as input. <p> im_slice() thresholds the image held by image descriptor in and writes the result on the image descriptor out. Output is a byte image with values less than threshold1) set to 0, values in [threshold1, threshold2) set to 128 and values greater than threshold2 set to 255 (x in range [a,b) means a<=x<b). <p> im_threshold() thresholds the image held by image descriptor in and writes the result on the image descriptor out. Output is a byte image with values less than threshold set to 0, and values greater or equal to threshold set to 255. <h2><a name='sect3' href='#toc3'>Return Value</a></h2> The function returns 0 on success and -1 on error. <h2><a name='sect4' href='#toc4'>See Also</a></h2> <a href='im_dilate.3.html'>im_dilate(3)</a> , <a href='im_erode.3.html'>im_erode(3)</a> , <a href='im_lessconst.3.html'>im_lessconst(3)</a> , <a href='im_and.3.html'>im_and(3)</a> . <h2><a name='sect5' href='#toc5'>Copyright</a></h2> <br> N. Dessipris, <h2><a name='sect6' href='#toc6'>Author</a></h2> N. Dessipris - 26/04/1991 <p> <hr><p> <a name='toc'><b>Table of Contents</b></a><p> <ul> <li><a name='toc0' href='#sect0'>Name</a></li> <li><a name='toc1' href='#sect1'>Synopsis</a></li> <li><a name='toc2' href='#sect2'>Description</a></li> <li><a name='toc3' href='#sect3'>Return Value</a></li> <li><a name='toc4' href='#sect4'>SeeAlso</a></li> <li><a name='toc5' href='#sect5'>Copyright</a></li> <li><a name='toc6' href='#sect6'>Author</a></li> </ul> </body> </html>
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