- 2016.09.19 18:47 "Re: [Tiff] Accuracy of TIFF Field metadata (COLORMAP)", by
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2016.11.14 22:49 "Re: [Tiff] Right way to make a multi-resolution pyramid", by Kemp Watson
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2016.11.14 18:16 "[Tiff] Right way to make a multi-resolution pyramid", by Kemp Watson
- 2016.11.14 18:40 "Re: [Tiff] Right way to make a multi-resolution pyramid", by Kemp Watson
- 2016.11.14 18:55 "Re: [Tiff] Right way to make a multi-resolution pyramid", by Dmitry Fedorov
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2016.11.14 18:16 "[Tiff] Right way to make a multi-resolution pyramid", by Kemp Watson
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