https://bugs.kde.org/show_bug.cgi?id=398548
Dmitry Kazakov <dimul...@gmail.com> changed:
What |Removed |Added
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CC| |dimul...@gmail.com
--- Comment #2 from Dmitry Kazakov <dimul...@gmail.com> ---
According to the TIFF standard, this compression mode is defined for 1
bit-per-pixel images only. So I think we should just remove this option
(alongside other two "fax" options).
=== Snip from the standard ===
2 = CCITT Group 3 1-Dimensional Modified Huffman run length
encoding. See Appendix B: "Data Compression -- Scheme 2."
BitsPerSample must be 1, since this type of compression is
defined only for bilevel images.
When you decompress data that has been compressed by
Compression=2, you must translate white runs into 0's and black
runs into 1's. Therefore, the normal PhotometricInterpretation
for those compression types is 0 (WhiteIsZero). If a reader
encounters a PhotometricInterpretation of 1 (BlackIsZero) for
such an image, the image should be displayed and printed with
black and white reversed.
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