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 Quote Link to comment 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. Quote Link to comment Share on other sites More sharing options...
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