How can I determine if a particular pixel in a GIF image is transparent in C#? I can see the MakeTransparent method in Bitmap, but nothing to determine if it is actually transparent already.
Thanks.
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How can I determine if a particular pixel in a GIF image is transparent in C#? I can see the MakeTransparent method in Bitmap, but nothing to determine if it is actually transparent already.
Thanks.
Use
GetPixeland then look at the Alpha component of theColorinstance returned. 0 = fully transparent.If you need to loop through all (or many) pixels, be aware that GetPixel is quite slow. A faster, but more involved way, is to use LockBits to lock the data in memory, then look at the bitmap data directly.