[libGD] #213 [Task opened] Additional image filters for PHP GD

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User who did this - Steve Denim (steve) 

Attached to Project - libGD
Summary - Additional image filters for PHP GD
Task Type - Feature Request
Category - General
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Normal
Reported Version - 2.0.35
Due in Version - Undecided
Due Date - Undecided
Details - I've added a couple of edge dectection image filters (IMG_FILTER_PREWITT, IMG_FILTER_SCHARR and IMG_FILTER_SOBEL) for use with PHP's imagefilter function.

These three filters also take an additional optional boolean argument (default is true) which will negate the filtered image.

As a by-product of these additions the patch also makes available one additional function (imageconvultion2) which is pretty much the same as the existing imageconvolution function except it takes two 3x3 matrices as arguments.

I originally emailed Pierre with two patch files, both achieved the same same thing but with slightly different implementations but have since decided to submit just one implementation.

I've attached the patch file which has been taken against the main trunk of PHP's source. Sample image results have also been attached although more, together with my sample test script can be viewed at http://www.redmonkey.org/php/additional-imagefilters/ , the images may be slow to load as they are being hosted from my lowly dev server with restricted bandwidth.

Thanks

More information can be found at the following URL:
http://bugs.libgd.org/?do=details&task_id=213

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