2016.09.19 16:29 "[Tiff] Accuracy of TIFF Field metadata (COLORMAP)", by

2016.11.14 19:09 "Re: [Tiff] Right way to make a multi-resolution pyramid", by Olivier Paquet

2016-11-14 13:16 GMT-05:00 Kemp Watson <kemp@objectivepathology.com>:

>

> What is the “correct” or canonical way to make a (tiled) multi-resolution

pyramid in TIFF?

Hard to say for sure given that the TIFF specification is not very well maintained. But I would lean toward your suggestion of:

Oh, and one more option: Base image has a single Sub-IFD tag, pointing to an array of all the reduced-resolution images.

However I've never tried it so there might be reasons it is not practical.

Most implementations I’ve seen simply chain top-level IFDs together,

starting with the base or full-res layer, and going smaller from there to

the apex. this seems wrong to me.

I don't know which implementations you're looking at but that's what is done in our domain. We did it that way to be compatible with others. And when they decided to do it that way, it's likely that the sub-IFD tag wasn't around yet. It causes some problems but not enough to bother change the format (for us anyway).

Olivier