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
Objective Pathology Services Limited
8250 Lawson Road
Canada L9T 5C6
tel. +1 (416) 970-7284
On 2017-11-10, 2:23 PM, "dsudar" <firstname.lastname@example.org on behalf of email@example.com> 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.
Sent from: http://maptools-org.996276.n3.nabble.com/Tiff-LibTIFF-f3.html