2005.09.08 16:21 "Re: [Tiff] libtiff question", by Joris Van Damme
I was wondering do you have any code for converting file format from tiff to gif?
Please choose your subject line more wisely, since it plays a major role in efficiency of search engines on archive content.
Converting from TIFF to GIF is not just a file format issue. GIF is much more restrictive when it comes to encoding of the pixel color data. While TIFF may contain just about anything, from RGB to L*a*b* to grayscale with 7 extra alpha channels to infrared photography of the earth with added floating point elevation maps, GIF can only contain color data with a palette of at most 256 entries. As such, any convertion code, even if starting from plain RGB TIFF images, will have to do a lot of additional processing to a) derive a good palette, b) convert to the palette. The terms 'quantizing' and 'dithering' come to mind, you may want to Google on that.
Joris Van Damme
Download your free TIFF tag viewer for windows here: