On Mon, Nov 9, 2009 at 12:44 PM, Eric Firing <efir...@hawaii.edu> wrote:
> PS backend already does things differently from others because it doesn't
> handle alpha, correct?  Does the patch make this situation any worse?
>

When there are multiple Images and render.option_image_nocomposite()
is false (as in the ps backend ), the images are composited
(rasterized) into a single image before it is passed to the backend.
So, AS FAR AS the images are concerned, I think the ps backend does
handle alpha correctly and the results are consistent between
backends.

And with the Andrew's patch, and if there are non-image artists
between two images, the results can be different. For example, those
non-image artists can be obscured by the foreground image in the agg
backend, but will always show up in the ps backend.
So, I think this is somewhat different issue than alpha being ignored
in the ps backend.

Regards,

-JJ

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