<!-- manual page source format generated by PolyglotMan v3.2, --> <!-- available at http://polyglotman.sourceforge.net/ --> <html> <head> <title>IM_ZONE(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_zone, im_fzone - creates a zone plate <h2><a name='sect1' href='#toc1'>Synopsis</a></h2> <b>#include <vips/vips.h></b> <p> <b>int im_zone(image, size)</b> <br> <b>IMAGE *image;</b> <br> <b>int size;</b> <p> <b>int im_fzone(image, size)</b> <br> <b>IMAGE *image;</b> <br> <b>int size;</b> <p> <h2><a name='sect2' href='#toc2'>Description</a></h2> <p> <b>im_fzone()</b> creates a float one band image of a zone plate of size size by size. Pels are in the range [-1,+1]. The zone plate has spatial frequencies increasing from 0 the center (at size/2, size/2) up to infinity at the edges. size must be positive and even. <p> <b>im_zone()</b> behaves exactly as im_fzone(), but writes a FMTUCHAR image scaled to the range 0-255. <p> <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_grey.3.html'>im_grey(3)</a> , <a href='im_fgrey.3.html'>im_fgrey(3)</a> . <h2><a name='sect5' href='#toc5'>Copyright</a></h2> N. Dessipris <h2><a name='sect6' href='#toc6'>Author</a></h2> N. Dessipris - 10/05/1991 <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'>See Also</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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