Kevin
I linked the imagecreatetruecolor manual from PHP site right above. Please tell me where you input anything but height and width. I beleive my links have shown the true operation of that function.
I beleive what happens is yes imagecreatetruecolor is used to process an image but thats done regardless of a watermark of not. There is no extra bit variable in that function.
Now the watermark if I am not mistaken takes an already processed image which happens second before of whatever and places a watermark on the photo. I beleive ImageCopy is used for that
Code:
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Thats why I linked the gd watermark code right above to show what goes on. I do beleive we use the correct strings as noted in the PHP site requirements. If there is an issue with GD2 itself and color sampling I dont know how we can rectify that. I can tell you this would not happen with Imagemagick.