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IMB: Read single-layer XYZ channels as a combined image #115290

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Omar Emara merged 4 commits from OmarEmaraDev/blender:openexr-read-xyz-channels into main 2023-12-13 10:01:19 +01:00
Conversation 6 Commits 4 Files Changed 1 +64 -18
Omar Emara commented 2023-11-23 07:51:16 +01:00
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Currently, the OpenEXR reader can't read single-layer XYZ images as a
combined image. Single-view images will only read the X channel, while
multi-view images will interpret the Z as a depth image and the Y and Z
channels will be treated as float passes.

This patch allows the reading of XYZ channels as combined images. For
single-view images, we just extend the RGB-like channel names we match
to contain XYZ. For multi-view images we only treat the Z channel as a
Depth one if no X and Y channels exists, since the Z in this case is
part of the XYZ image.

Currently, the OpenEXR reader can't read single-layer XYZ images as a combined image. Single-view images will only read the X channel, while multi-view images will interpret the Z as a depth image and the Y and Z channels will be treated as float passes. This patch allows the reading of XYZ channels as combined images. For single-view images, we just extend the RGB-like channel names we match to contain XYZ. For multi-view images we only treat the Z channel as a Depth one if no X and Y channels exists, since the Z in this case is part of the XYZ image.
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Omar Emara added 1 commit 2023-11-23 07:51:27 +01:00
dc230a2950 IMB: Read single layer XYZ channels as a combined image 
Currently, the OpenEXR reader can't read single-layer XYZ images as a
combined image. Single-view images will only read the X channel, while
multi-view images will interpret the Z as a depth image and the Y and Z
channels will be treated as float passes.

This patch allows the reading of XYZ channels as combined images. For
single-view images, we just extend the RGB-like channel names we match
to contain XYZ. For multi-view images we only treat the Z channel as a
Depth one if no X and Y channels exists, since the Z in this case is
part of the XYZ image.
Omar Emara requested review from Sergey Sharybin 2023-11-23 07:51:48 +01:00
Sergey Sharybin commented 2023-11-24 16:41:37 +01:00
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If we are saving vector data as XYZ it does make sense to be open it as XYZ. So from this point of view the patch makes sense.

What I am confused a bit, is the specs of the EXR. Y is for luminance, Z is for depth. And I can't find some specification which will cover a topic of when channels are combined together.

@brecht What does your knowledge say here? :)

If we are saving vector data as XYZ it does make sense to be open it as XYZ. So from this point of view the patch makes sense. What I am confused a bit, is the specs of the EXR. Y is for luminance, Z is for depth. And I can't find some specification which will cover a topic of when channels are combined together. @brecht What does your knowledge say here? :)
Brecht Van Lommel commented 2023-11-24 19:42:11 +01:00
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There are no strict rules here, and we indeed need heuristics like this. The OpenEXR specs are also not followed by various apps.

Did you check if chroma is imported correctly?

I would expect:
Y only -> chroma
Y BY RY -> YCC
Z only -> depth
X Y Z -> XYZ vector

There are no strict rules here, and we indeed need heuristics like this. The OpenEXR specs are also not followed by various apps. Did you check if chroma is imported correctly? I would expect: Y only -> chroma Y BY RY -> YCC Z only -> depth X Y Z -> XYZ vector
Omar Emara added 1 commit 2023-11-27 13:36:11 +01:00
Omar Emara commented 2023-11-27 13:43:29 +01:00
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@brecht I unfortunately couldn't test chroma images, because all sample images I trid used subsampling, which is something we apparently do not handle at the moment. I tried a quick fix for that but it will take more time as it doesn't seem straightforward.

Do you happened to have samples images I can test?

Regardless, I refactored the patch a bit to be more explicit in those cases.

@brecht I unfortunately couldn't test chroma images, because all sample images I trid used subsampling, which is something we apparently do not handle at the moment. I tried a quick fix for that but it will take more time as it doesn't seem straightforward. Do you happened to have samples images I can test? Regardless, I refactored the patch a bit to be more explicit in those cases.
Brecht Van Lommel commented 2023-11-27 13:53:25 +01:00
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This seems to be one with just Y:
https://github.com/AcademySoftwareFoundation/openexr-images/blob/main/LuminanceChroma/Garden.exr

This seems to be one with just Y: https://github.com/AcademySoftwareFoundation/openexr-images/blob/main/LuminanceChroma/Garden.exr
Brecht Van Lommel approved these changes 2023-11-27 13:54:16 +01:00
Omar Emara added 1 commit 2023-11-27 14:02:10 +01:00
buildbot/vexp-code-patch-coordinator Build done. Details
166522f8fc Broadcast Y to all three channels
Omar Emara commented 2023-11-27 14:02:34 +01:00
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@blender-bot build

@blender-bot build
Omar Emara added 1 commit 2023-11-27 15:09:01 +01:00
buildbot/vexp-code-patch-coordinator Build done. Details
0ba009a01b Merge branch 'main' into openexr-read-xyz-channels
Omar Emara commented 2023-11-27 15:13:16 +01:00
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@blender-bot build

@blender-bot build
Omar Emara merged commit 23df139aaf into main 2023-12-13 10:01:19 +01:00
Omar Emara deleted branch openexr-read-xyz-channels 2023-12-13 10:01:21 +01:00
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