Shading Depth (Pz) in Image Viewer but not in Composite View

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Hi all, I rendered an EXR image sequence with an Shading Depth (Pz) image plane. I can see the Pz in the Image Viewer app, but not in the Composite View tab in Houdini. Why?
Please check the attached image.
Edited by Grendizer - 2020年5月8日 12:33:37

Attachments:
Exr with Image Plane Shading Depth not available in Composite veiw.jpg (109.6 KB)

Houdini gamboler
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Update: I re-rendered the EXR, but this time I changed an option :
In the mantra render node > tab images > tab output > quantization = 32 bit float
So now the Pz image plane is available in the composite tab as well. AND the fog works (see my other thread).

But there's something I find strange : if the 16 bit option does not create a valide Pz, why can I see it in the Image Viewer app?
Thanks

Gz
Houdini gamboler
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