AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2006.04.04 16:50 "[Tiff] BigTIFF Suggestion", by Larry Michaels
2006.04.04 21:33 "Re: [Tiff] BigTIFF Suggestion", by Chris Cox
2006.04.06 09:46 "Re: [Tiff] BigTIFF Suggestion", by Gerben Vos
[...]

2006.04.04 16:50 "[Tiff] BigTIFF Suggestion", by Larry Michaels

I would like to propose the addition of a field to the BigTIFF specification, perhaps in the header, to specify the offset to the last IFD. This would make the task of appending new images to the end of the BigTIFF file much more efficient than it currently is. Currently, appending an image requires seeking to each IFD, starting with the first, reading the tag count value, and then seeking to the next IFD offset value until the last IFD is found. This can be quite time-consuming when appending images to files which already contain a large number of images. Being able to seek directly to the last IFD would radically improve performance in such situations.

Larry Michaels