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I've got this to join 2 images together and replace the color blue from TrueColor.jpg with BackGround.jpg.

This works but there are a few blue sploches because not all blue is truely blue. So what I am looking for is a way to bring the blue tolerance up to cover the image. Both images must be a jpeg image and not png or gif.

$image = ImageCreateFromJPEG("BackGround.jpg");

$icon = ImageCreateFromJPEG("TrueColor.jpg");





$trans = imageColorallocate($image, 0,0,255);

ImageColorTransparent($icon,$trans);

$width = ImageSX($icon);

$height = ImageSY($icon);





ImageCopyResized($image,$icon,0,0,0,0,$width,$height,$width,$height);