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Fast image sharpning

Hi guys,

We've got a content management system in PHP that allows users to upload
images that are resized and sharpened.

The resizing is done using the GD libraries resampling function and to
sharpen it I use a convolution function that goes though every pixel in the
image and using the neighboring pixels plots the new value over it.
Unfortunatly the convolution is rather slow and takes a long time (I guess
because there are so many loops involved).

Is there a quicker way to sharpen an image? I've tried using the command
line program ImageMagick but unfortunatly I can't get it to work (see my
previous post), are there any optimised sharpen functions or pluggins for
PHP that would speed the process up?
Jul 17 '05 #1
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