[cl-pdf-devel] transparency?
Marc Battyani
marc.battyani at fractalconcept.com
Thu May 24 21:39:58 UTC 2007
"Cyrus Harmon" <ch-lisp at bobobeach.com> wrote:
> Is there a way that I can set the page background to be transparent using
> cl-pdf? I'd like to be able to draw (at least partially) opaque items
> onto a transparent background but can't figure out how to do so.
What do you mean by transparency? Alpha channels? The text drawing for
instance has no background color so is already transparent except for the
glyphs.
IIRC, the PNG also supports transparency for the images.
Otherwise the PDF format supports an exhaustive tranparency model (chapter 7
in the PDF reference). So it's probably not that hard to do whatever you
want to.
Marc
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