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2008.04.17 11:57 "Re: efficient thumbnailing", by Dr Michael J Chudobiak
Joris Van Damme (AWare Systems) wrote: > Dr. Michael J. Chudobiak 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 Joris, 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