note 56144 added to ref.image

To sharpen an image, rather than using the code below that produces a sharpening filter with php, use the built-in GD function "imageconvolution" which is designed for this purpose. Matrices can be used for sharpening, blurring, edge detection, etc, ala Photoshop. A sharpening example: <?php $sharpenMatrix = array(-1,-1,-1,-1,16,-1,-1,-1,-1); $divisor = 8; $offset = 0; imageconvolution($myImage, $sharpenMatrix, $divisor, $offset); ?> Below is some information on building different kinds of matrices. (If you have photoshop (or PSP, GIMP) you can test out your matrices before applying them in PHP) http://loriweb.pair.com/8udf-basics.html (covers blurs) http://loriweb.pair.com/8udf-sharpen.html http://loriweb.pair.com/8udf-edges.html http://loriweb.pair.com/8udf-emboss.html ---- Manual Page -- http://www.php.net/manual/en/ref.image.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+56144 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+56144&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+56144&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+56144&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+56144&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+56144&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+56144&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+56144&report=yes Search -- http://master.php.net/manage/user-notes.php