2017.11.11 02:38 "Re: [Tiff] Right way to make a multi-resolution pyramid", by Kemp Watson

As far as I can see, absolutely EVERYONE violates the TIFF standard, or at least it¹s intent, when it come to zoomable images.

Everyone seems to be storing resolution levels in pages (top-level IFDs), as opposed to SubIFDs, when SubIFDs exist to represent alternative views of the SAME image, which is what a resolution level is. Also, most everyone still names their files with a .tif extension, a non-no per the spec. My take, apparently alone.

We¹re attempting to address the standardization of a common subset, 3-channel 8-bit zoomable images, for web viewing, via ZIF (a BigTIFF-derived format, not TIFF), but this won¹t help you with multispectral imagesŠ even for our use case, we¹re stuck with doing it the ³wrong² way as a less-favoured option.

If you¹re dealing with digital pathology slides, TIFF is likely not a practical option, in any case.

W. Kemp Watson

kemp@objectivepathology.com

Objective Pathology Services Limited

8250 Lawson Road
Milton, Ontario
Canada L9T 5C6

www.objectivepathology.com
tel. +1 (416) 970-7284

On 2017-11-10, 2:23 PM, "dsudar" <tiff-bounces@lists.maptools.org on behalf of dsudar@lbl.gov> wrote:

I've started looking at this same issue for our large number of channels TIFF images from multiplex immunofluorescent staining of tissue on slides. Has a consensus been reached how the pyramid of resolution levels should be stored? There seem to be many different and incompatible approaches in use now and I would like to stick to an agreed standard. This appears to be the forum that would know.

Thanks,
- Damir

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