> If you could preprocess the images
no, I have to create a mask of an image that I create from scratch with
Imaging Lingo
> you could probably use set/getpixel to tickle each pixel
set/getpixel would certainly work, but it is far too slow

I still have hope that it might work with copyPixels. In his book "Director
Shockwave Studio Developer's Guide" James Newton describes a way of
"Isolating a color" with the copyPixels command using the
#backgroundTransparent ink and setting the #color and #bgColor properties to
the same value. (page 74)

Unfortunately that doesn't help me either. (Or I'm just too stupid ...)

Thanks anyway
Michael

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