woolyg Posted June 1, 2012 Share Posted June 1, 2012 Hi all, I need to take a PNG image, and superimpose a triangle shape into it, and make everything *outside* the triangle to be resampled as transparent, so it appears like the once-rectangular image is now a triangle (but it's still a rectangle with a non-transparent triangle within it). I've been searching all over, but the GD library seems to only work on rectangle/square images... has anyone seen any resources on how to do this? All the best, WoolyG Link to comment https://forums.phpfreaks.com/topic/263465-gd-library-help/ Share on other sites More sharing options...
Barand Posted June 1, 2012 Share Posted June 1, 2012 Create a second (mask) image the same size as the original, fill it with white. Create a black triangle (or any other shape). If you now scan each row pixel by pixel then if it is a white pixel you make the corresponding pixel in the original transparent. If it is a black pixel, leave it alone. Link to comment https://forums.phpfreaks.com/topic/263465-gd-library-help/#findComment-1350226 Share on other sites More sharing options...
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