<!-- manual page source format generated by PolyglotMan v3.2, --> <!-- available at http://polyglotman.sourceforge.net/ --> <html> <head> <title>LIGHT_CORRECT(1) manual page</title> </head> <body bgcolor='white'> <a href='#toc'>Table of Contents</a><p> <h2><a name='sect0' href='#toc0'>Name</a></h2> light_correct - correct illumination errors on set of images <h2><a name='sect1' href='#toc1'>Synopsis</a></h2> <b>light_correct grey image1 image2 image3 ...</b> <h2><a name='sect2' href='#toc2'>Description</a></h2> The first argument should be an image of a piece of grey card, subsequent arguments should be images taken with the same lighting set-up which need correcting. The corrected images are written to files prefixed with "ic_". <p> For example, suppose you have a directory with the following files in: <p> example% ls<br> dat1.1.v dat1.2.v dat2.1.v dat2.2.v dat3.1.v dat3.2.v<br> dat4.1.v dat4.2.v grey.v<br> <p> then run light_correct like this: <p> example% light_correct grey.v dat*.v<br> <p> to generate this: <p> example% ls<br> dat1.1.v dat1.2.v dat2.1.v dat2.2.v dat3.1.v dat3.2.v<br> dat4.1.v dat4.2.v grey.v<br> ic_dat1.1.v ic_dat1.2.v ic_dat2.1.v ic_dat2.2.v ic_dat3.1.v<br> ic_dat3.2.v ic_dat4.1.v ic_dat4.2.v<br> <p> light_correct works by smoothing out the grey card image, finding grey-mean/pixel for each point, and then multiplying the result by all the following images. It also removes any .desc files it generates, to avoid problems with <a href='im_global_balance.3.html'>im_global_balance(3)</a> . <p> <h2><a name='sect3' href='#toc3'>Return Value</a></h2> returns 0 on success and non-zero on error. <h2><a name='sect4' href='#toc4'>See Also</a></h2> <a href='header.1.html'>header(1)</a> , <a href='vips.1.html'>vips(1)</a> <h2><a name='sect5' href='#toc5'>Copyright</a></h2> The National Gallery and Birkbeck College, 1989-1996. <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> </ul> </body> </html>
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