[gs-bugs] [Bug 689080] PDF Crash with Transparency at 2880 dpi

bugs.ghostscript.com-bugzilla-daemon at ghostscript.com bugs.ghostscript.com-bugzilla-daemon at ghostscript.com
Mon Jul 14 10:12:27 PDT 2008


------- Additional Comments From ralph.giles at artifex.com  2008-07-14 10:12 -------
In addition to the JPXDecode images (and I've never seen a PDF file that used
the tranparency features; we should investigate what Adobe Reader actually does,
since the spec is a bit vague) both XPS and SVG include PNG as an image source
type which encodes an interleaved transparency plane.

Currently the xps code extracts that plane separately and uses it to create a
separate mask, so this is more of a convenience and efficiency issues than an
absolute requirement. But generally the way transparency is handled as a
separate mask in pdf rather than an intrinsic part of object drawing is  old
fashioned by the standards of newer formats. So I do not think breaking
assumption 2 is a good direction to go for the future.

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