Nikaj Wiggers wrote:
>
> Thanks!
> But how can I move the Alpha channel as a mask?
>
> nikaj
>
> Carl West wrote:
> >
> > Easy enough to do using mask ink on im3 and changing the regPoint on
> > im3's mask according to the movement of im2 over im1.
You don't move the alpha channel, you move the mask. If the distinction
isn't clear, read a bit about the mask ink effect.
The only alpha channel might be on im2, im3 would be behind im2 and in
front of im1.
im2 will cover the aliased edge on im3
The mask for im3 would be a 1-bit image that is bigger than the hole
in im2 but smaller than the outside of im2
Sort of a cross-section of the image:
(the image is viewed from here)
im2 ...__________... ...________...
..............................im3-------------------------.................
im1------------------------------------------------------------------------
the dotted parts of im3 are invisible because of the placement of the
regpoint on im3's mask member.
the dotted parts of im2 are the antialiasing from its alpha channel
when im2 gets moved:
im2 ...__________... ...________...
.............im3-------------------------..................................
im1------------------------------------------------------------------------
--
Carl West [EMAIL PROTECTED]
617.262.8830 x246
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