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May 1997
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1997.05.30 22:02 "Re: PackBits confusion", by Helge Blischke
When I recently implemented a TIFF reader in PostScript, I also
implemented PackBits decoding using the RunLengthDecode Filter.
The PostScript "red book", section 3.13, RunLength{De|En}code Filter
states that the code 128 (0x80) is treated as an EOD (End Of Data)
marker. I did some tests with Macintosh (Photoshop) images written
with PackBits compression, and, appending 128 to the end or the
stream, the images were properly processed. So I'd think treating
this code as a noop should be the only correct interpretation.
Helge
------------------------
H.Blischke@srz-berlin.de
H.Blischke@srz-berlin.com
H.Blischke@acm.org