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

2016.11.14 18:40 "Re: [Tiff] Right way to make a multi-resolution pyramid", by Kemp Watson

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

I can¹t seem to find a full explanation of the right way to make a pyramid.

W. Kemp Watson
kemp@objectivepathology.com

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

Subject: Right way to make a multi-resolution pyramid

Hi all:

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

Most implementations I¹ve 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.

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