At 07:49 PM 2/2/2002 +0100, Henning Hraban Ramm wrote:
> > >I have tried this using a RGB-PNG-image above a Metapost-image
> > >including only a rectangle filled with the background-color
> > >of the PNG-image. I can see no difference between both backgrounds.
> > >Is your image in cmyk or in rgb?
>
>RGB. But it may be a matter of color management, as Hans assumed.
>
> > >i think not all can be done on TeX-level. For example the alpha-channel
> > >in png or tiff-images, it would be nice when pdftex could support this
> > >directly.
>
>Try PDF! At least clipping paths are working.
if you can find out the right snippets of pdf code needed .. or make stand
alone pdf graphics illustrating the principle ... this is how i could
figure out transparency: make a file in AI and look at the pdf code.
Hans
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