Saving pyramid for multidimentional tiff.

Hi John.

The tiff format should be able to support saving pyramids, I’ve asked that question here : https://github.com/ome/design/issues/104

in pyvips, I am able to save a 2D image with a pyramid fine, and then get the layer of the pyramid with the page argument in tiffload.

But if I save a tiff image with just 2 dimentions (for instance, z =2 ) and save it with the pyramid=True argument, it doesnt seem to work.

Minimum working example. teststack.tif is here : teststack.zip

import pyvips

img2d = pyvips.Image.tiffload("teststack.tif")
img3d = pyvips.Image.tiffload("teststack.tif", n=2)

img2d.tiffsave("img2d.tif", pyramid=True, tile=True)
img3d.tiffsave("img3d.tif", pyramid=True, tile=True)

img2dback = pyvips.Image.tiffload("img2d.tif", page=1)
img3dback = pyvips.Image.tiffload("img3d.tif", page=1)

print(img2dback)
print(img3dback)

Which gives

<pyvips.Image 300x300 uchar, 3 bands, srgb>
<pyvips.Image 600x600 uchar, 3 bands, srgb>

Is there any way to retrieve the pyramid of the image which contains an image in the z dimension?

[jcupitt]

Ooop, sorry, you’re right. As you say, 8.10 is subifd pyramids, 8.11 is jp2k.

I’ve added the doc updates to git master pyvips (will be 2.1.16), thanks for the reminder.

[petoor]

For anyone finding this issue. From @jcupitt’s previous answer.

Update: libvips 8.11 now supports OME-style subifd tiff image pyramids. The release notes have some background: https://libvips.github.io/libvips/2020/06/18/What’s-new-in-8.10.html#pyramids

He specifies libvips 8.11, but links to the 8.10 documentation. 8.10 seems to work just fine.

In 8.11 jpeg2000 is added. https://forum.image.sc/t/libvips-8-11-is-out-and-adds-support-for-ome-tiff-with-jpeg2000-compression/53787

In order to use jpeg2000 and not jpeg. change compression="jpeg" to compression="jp2k" However, it seems that “jp2k” is missing from https://libvips.github.io/pyvips/enums.html#pyvips.enums.ForeignTiffCompression