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July 2004
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2004.07.01 23:09 "MINISBLACK not working for COMPRESSION_CCITT_T6 document", by Ron James
I'm making the following calls:
TIFFSetField(iTFile, TIFFTAG_COMPRESSION, COMPRESSION_CCITT_T6);
TIFFSetField(iTFile, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISBLACK);
And my document is created in reverse - i.e. white text on a black
background.
So I change the 2ns call as follows:
TIFFSetField(iTFile, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
And still get the same effect - white text on black.
However if I switch the COMPRESSION to COMPRESSION_PACKBITS, the
TIFFTAG_PHOTOMETRIC calls switch between whits on black and black on white.
What am I missing? How can I get a black text on white document using
CCITT_T6?
Many thanks
Ron James
Sr. Software Engineer
EnvoyWorldWide, Inc.
781.482.2110
www.envoyworldwide.com
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