[texhax] Transparency via \includegraphics?

[Alexandru Scorpan]

>> Example: png via pdftex.
>> Project: set an image with transp. background over gray page w/o
>> getting a white surrounding rectangle.  (And without modifying the
>> source image.)
>
> I am afraid that the PostScript specification defines the language as
> drawing with opaque ink on top of a page (ink overwrites ink).

Thx, but my question referred to a PNG image, where the transparency 
coded into the image is simply ignored and replaced with white.

-- Alex