EXR reading : dimensions are based on dataWindow (not displayWindow), leading to e.g. Renderman Cryptomatte processed wrongly by Blender compositor #109894

New Issue

refractal-studios · 2023-07-10T09:33:06+02:00

$refractal-studios$

$refractal-studios$ refractal-studios commented

2023-07-10 09:33:06 +02:00

Operating system: MacOS Sonoma Beta
Graphics card: AMD RX6600XT

Blender Version
Broken: ( 3.6, c7fc78b81e, release, 2023-06-27 )
Worked: (none)

Renderman cryptomatte pass images are read wrongly by blender compositor. It is changing the height of the image, based on the alpha, instead of keeping a fixed size. Even Blender 3.6.1 latest version has same issue.

Exact steps for others to reproduce the error

create a simple scene with spheres and cubes. leave empty space at the top of frame.
render images with crypto matte using render man addon.
bring the images into blender compositor using cryptomatte node.

Operating system: MacOS Sonoma Beta Graphics card: AMD RX6600XT **Blender Version** Broken: ( 3.6, c7fc78b81ecb, release, 2023-06-27 ) Worked: (none) Renderman cryptomatte pass images are read wrongly by blender compositor. It is changing the height of the image, based on the alpha, instead of keeping a fixed size. Even Blender 3.6.1 latest version has same issue. **Exact steps for others to reproduce the error** 1. create a simple scene with spheres and cubes. leave empty space at the top of frame. 2. render images with crypto matte using render man addon. 3. bring the images into blender compositor using cryptomatte node.

Cryptomatte_test.blend

1.2 MiB

Frame 1.png

472 KiB

Frame 10.png

496 KiB

$refractal-studios$ refractal-studios added the

labels 2023-07-10 09:33:07 +02:00

Evan Wilson commented

2023-07-11 18:48:03 +02:00

Hi @refractal-studios.

Can you please upload two EXR files showing the issue?

Hi @refractal-studios. Can you please upload two EXR files showing the issue?

Evan Wilson added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2023-07-11 18:48:18 +02:00

$refractal-studios$

$refractal-studios$ refractal-studios commented

2023-07-12 13:37:28 +02:00

It's not an issue with exr files. Fusion is properly reading them.
somehow blender compositor is cropping the empty part of the image to take only matte area.

Anyway I am attaching the exr images too.

It's not an issue with exr files. Fusion is properly reading them. somehow blender compositor is cropping the empty part of the image to take only matte area. Anyway I am attaching the exr images too.

crypmat crop.png

63 KiB

Scene.ViewLayer.path.cryptomatte.0010.exr

127 KiB

Scene.ViewLayer.path.cryptomatte.0001.exr

123 KiB

Scene.ViewLayer.path.cryptomatte.0010.exr

Scene.ViewLayer.path.cryptomatte.0001.exr

Evan Wilson added

Status

Needs Triage

and removed

Status

Needs Information from User

labels 2023-07-17 12:16:57 +02:00

Evan Wilson commented

2023-07-17 13:43:14 +02:00

Looking at the header of each file using exrheader.exe, it appears that Blender is reading the dataWindow, and using it to set the displayWindow.

0001.exr
Dimensions in Blender 960 x 419

exrheaer.exe
dataWindow (type box2i): (0 38) - (959 456)
displayWindow (type box2i): (0 0) - (959 456)

0010.exr
Dimensions in Blender 960 x 454

exrheaer.exe
dataWindow (type box2i): (0 3) - (959 456)
displayWindow (type box2i): (0 0) - (959 456)

I also found that in 48e8d8f910/source/blender/imbuf/intern/openexr/openexr_api.cpp there is no displayWindow only dataWindow. Just noting that in case it is helpful.

Looking at the header of each file using `exrheader.exe`, it appears that Blender is reading the dataWindow, and using it to set the displayWindow. 0001.exr Dimensions in Blender `960 x 419` ``` exrheaer.exe dataWindow (type box2i): (0 38) - (959 456) displayWindow (type box2i): (0 0) - (959 456) ``` 0010.exr Dimensions in Blender `960 x 454` ``` exrheaer.exe dataWindow (type box2i): (0 3) - (959 456) displayWindow (type box2i): (0 0) - (959 456) ``` I also found that in https://projects.blender.org/blender/blender/src/commit/48e8d8f910c4cce537bfe069e99949f3e326b554/source/blender/imbuf/intern/openexr/openexr_api.cpp there is no `displayWindow` only `dataWindow`. Just noting that in case it is helpful.

$refractal-studios$

$refractal-studios$ refractal-studios commented

2023-07-19 12:25:37 +02:00

Thanks for finding the problem. data window is based on the objects in the frame. if there is only a small sphere, then the data window will be like 100 x 100, when actual fixed display window of image is 960 x 457.

Philipp Oeser commented

2023-07-19 13:07:07 +02:00

I think this is something the Core / Images & Movies has to judge.
But will confirm for now.

I think this is something the `Core` / `Images & Movies` has to judge. But will confirm for now.

Philipp Oeser changed title from ~~Renderman Cryptomatte processed wrongly by Blender compositor~~ to EXR reading : dimensions are based on dataWindow (not displayWindow), leading to e.g. Renderman Cryptomatte processed wrongly by Blender compositor

2023-07-19 13:08:54 +02:00

Philipp Oeser added

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

EXR reading : dimensions are based on dataWindow (not displayWindow), leading to e.g. Renderman Cryptomatte processed wrongly by Blender compositor #109894