- 2004.12.07 11:32 "Re: [Tiff] Fetching pixel data from 4bit tiff", by Joris Van Damme
- 2004.12.07 15:52 "Re: [Tiff] Fetching pixel data from 4bit tiff", by Bob Friesenhahn
2004.12.07 11:48 "Re: [Tiff] Fetching pixel data from 4bit tiff", by Joris Van Damme
Ah, excelent. I was starting to doubt my data. So if it converts from greyscale to RGBA, surely the R, G, B values would all be the same? eg
R=45
G=45
B=45The data I'm pulling out doesn't fit this pattern at all:
eg:
R G B71 202 94
14 209 94
213 215 94
156 222 94
99 229 94
I'm not using the stuff myself, but it should indeed return R=G=B if the source is indeed grayscale. Perhaps we can see what's going on if you post a tagdump of the source tiff, and a code snippet. (A tagdump can be made with a tool included in LibTiff, tiffinfo, or by the tag viewer pointed to in my signature if you're a windows user.)
Joris Van Damme
info@awaresystems.be
http://www.awaresystems.be
Download your free TIFF tag viewer for windows here:
http://www.awaresystems.be/imaging/tiff/astifftagviewer.html