 | | | Compositing 32bit (+alpha) images | Compositing 32bit (+alpha) images 2003-12-07 - By Brennan
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On Sat, 6 Dec 2003 11:20:26 -0600, "Chuck Neal"
<chuck@(protected)> wrote:
> If you need to combine alphas, extract both,
> copyPixels, then combine the Alphas by using a
> copyPixels and #darkest ink. (You can also do some
> other tricks to do combinations but this gives you the
> opaque areas together.) Then reset the alpha...
>
> Lets say I is image 1 and i2 is image 2
>
> A = i.extractALpha()
> A2 = i2.extractalpha()
> i.copyPixels(i2, i2.rect, i2.rect)
> A.copyPixels(a2, a2.rect, a2.rect, [#ink : #darkest])
> i.setALpha(a)
Yes, this works for merging two images with alpha channels, but does not
solve the issue of putting antialiased text onto a background, because
you'd end up losing the text altogether. I probably should have been more
clear, because there is a real difference between the two.
Colin's solution is admirable, however, and Alexx's movie is super.
Thanks.
Brennan
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