|AWARE [SYSTEMS]||Imaging expertise for the Delphi developer|
|TIFF and LibTiff Mailing List Archive|
LibTiff Mailing List
1998.03.24 14:29 "Re: 3-bit color RGB", by Martí María
Hello, >According to the TIFF 6.0 spec, 3-bit RGB is not allowable. Is this correct? I don't know if >there have been change docs allowing things like 1,2,or 4bit RGB. Looks like the spec >says 8bit only. I'd really like to be able to do 1,2, or 4 bit, but don't want to generate something that >no one will be able to read. Last week I was wondering about 'custom' compression schemes, and I found some interesting issues. The ISO JBIG compression is supossed to work with 3 bits per pixel. You can find more info in http://www.jbig.org Since the algorithm is far too complex, and licensing is required I don't expect see the codec here, but there is an entry in tiff.h for this type of compression. Alas, 3 bpp must be supported if JBIG is supported elsewhere... Regards. Martí Maria.