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TIFF and LibTiff Mail List Archive

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1994.08.10 16:40 "TIFF photometric question", by Adrian Phillips
1994.08.10 17:37 "Re: TIFF photometric question", by Sam Leffler
1994.08.23 14:10 "Re: TIFF photometric question", by Adrian Phillips

1994.08.10 16:40 "TIFF photometric question", by Adrian Phillips

We are converting a raw group 3 fax message embedded in another to postscript holding the messages on disk in compressed (g3 or g4) format. We use pbm's g3topbm to convert to pbm, pnmtotiff to convert to tiff, and then tiff2ps to convert to postscript for printing.

After the pnmtotiff, the tiff images have photometric min-is-black - the images we're originally scanned in with white background and black foreground. When the last version of tiff2ps is used the images come out thus, but if the new version 3.3 is used, the images come out reversed. I interpret min-is-black to mean that this reversing should take place (TIFF spec says WhiteIsZero/BlackIsZero) - is this correct?

Thank you,

Adrian

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