[gs-bugs] [Bug 691488] PDF 1.7 FTS: image incorrect

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Thu Jul 29 23:30:33 UTC 2010


--- Comment #11 from Alex Cherepanov <alex.cherepanov at artifex.com> 2010-07-29 23:30:31 UTC ---
I had an impression that SMask image data source can be interleaved with
the base image data source using several interleave methods.
IN FACT, this is true only for transparent/opaque mask in PostScript
Type 3 images.

Our implementation needs a separate SMask stream. This stream can be extracted
from the interleaved stream on the interpreter level at the cost of calling
one PS procedure per pixel.

Probably, we need a new JPXDecode parameter to select the channels
from JPX image.

As a stopgap measure, we can drop opacity channel completely.

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