2008.04.16 13:26 "[Tiff] efficient thumbnailing", by Dr. Michael J. Chudobiak

2008.04.17 11:57 "Re: [Tiff] efficient thumbnailing", by Dr. Michael J. Chudobiak

Joris Van Damme (AWare Systems) wrote:

Is there an efficient way to generate thumbnails from tiff files?

Stating the obvious but much neglected, make sure you use all and any thumbnails present in the file for starters.

One source of thumbnails or downsampled copies is the SubIFD child IFDs. A less known and older (and regrettable and discouraged) way to encode thumbnails, that is still in use today, is linking additional IFDs in


Thanks for the comments - but I have never trusted embedded thumbnails. In my experience, too many programs are unaware of them or handle them improperly for them to be trustworthy. (As a gThumb developer, I know that gThumb used to leave jpeg-exif thumbnails unchanged after rotating or cropping, for example.)

- Mike