2016.11.14 18:16 "[Tiff] Right way to make a multi-resolution pyramid", by Kemp Watson

Hi all:

What is the ³correct² or canonical way to make a (tiled)
pyramid in TIFF? multi-resolution

Most implementations I¹ve seen simply chain top-level IFDs together, with the base or full-res layer, and going smaller from there starting

to the apex. this seems wrong to me.

The description of the SubIFD tag indicates it should be used for reduced-resolution images. To make matters more complex, the NewSubfileType tag, which appears to be a different ³sub-file² type than a SubIFD, since it can be used for top-level pages/images, also indicates a value for a reduced-resolution image.

And, if a SubIFD is used, should it point to a chain of IFDs at the second level, or to an image with a SubIFD pointing to an image, ongoing recursively (which appears to me most correct, but most complex)?

W. Kemp Watson
kemp@objectivepathology.com

Objective Pathology Services Limited
www.objectivepathology.com
tel. +1 (416) 970-7284