 | | | Compositing 32bit (+alpha) images impossible? | Compositing 32bit (+alpha) images impossible? 2003-12-06 - By Brennan
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Hi folks, just checking. I am sure this is the best place to ask, too.
With imaging lingo 'as is' there is no way of compositing two (or more)
images with alpha channels, right? When I use copy pixels, the alpha of
the 'incoming' image overwrites the other one, rather than being used to
merge the color data. Makes sense, and useful in most cases, but not this
one.
I'm trying to make antialiased colored text on a colored background and it
seems to be pretty much impossible although there are halfway solutions
using darken/darkest if you keep the foreground and background colors
within known ranges. Dark text on pale backround can be hacked together
quite nicely, but I was hoping for a more general solution which also
worked with any old 32bit images.
I have checked the archives of this list and Direct-L, which was not very
encouraging.
One thing I haven't tried (and don't really understand) is createMatte()
and createMask() which seems like it may offer a solution. After all, mask
ink is a compositing operation, so it ought to be possible to pull out the
alpha channel, create a matte (or mask) from it, and then use copyPixels
with the mask ink.
Am I barking up the wrong tree, or is there no tree?
AFAICT this is the main shortcoming of imaging lingo today, but as I don't
see endless complaints about it, I wonder if a solution exists.
Brennan
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