[racket] overlay two or more images

In the as yet unreleased version you should use make-bitmap to make
the bitmap and probably everything will just work.

If you're stuck with the release, then you want to make the bitmap%
with the 'png/mask probably and then when you call draw-bitmap you
have to supply the mask bitmap as an explicit argument.

hth,
Robby

On Fri, Nov 19, 2010 at 11:44 PM, 김태윤 <kty1104 at gmail.com> wrote:
> hello
> I am trying to overlay two or more images(not in universe)
> but I can't make it as transparent
> setting brush with transparent option doesn't work
> original image's format is png though.
> do I have to convert them into bitmap?
> or is there any option or something to make it transparent?
> thanks in advanced
>
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