Mono-channel EXR files are unreadable #77574

New Issue

Loïc DAUTRY · 2020-06-07T18:26:58+02:00

Loïc DAUTRY commented

2020-06-07 18:26:58 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75

Blender Version
Broken:

2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: 211b6c29f7
2.90.0 Alpha, branch: master, commit date: 2020-06-06 14:18, hash: aed11c673efe

Short description of error
Similar to this report: #40547
Blender can't correctly read EXR files containing only one channel. Files are displayed totally black, even using separate RGB/XYZ nodes or isolating the correct channel in the Image Editor.

Exact steps for others to reproduce the error
In my case: I use displacements maps from Quixel Megascans. Their particularity is that, displacement being only a BW data, they store all the data in the R channel. But the catch is: there are no G or B channels at all. For anyone who uses Quixel's assets, it's quite a big deal since every displacement map is either mono-channel EXR, or BW JPEG which isn't ideal for displacement.

Here's a .blend for you to test, it contains two free EXR textures from Quixel Megascans; displacement and normal map; as well as two custom-made EXR files (using Nuke).

EXR_Mono_Channel_Test.blend

If you open the file and just try to play around with the separate RGB in the shader editor or with the channels display in the image editor, you'll see the result is always black using the red only textures, while the full RGB channels ones work correctly.

If you unpack the maps and open them inside another software, may it be a picture viewer or editor, it will display a red and black picture because the BW data is stored in the red channel and most of these softwares will usually recreate any missing RGB channels as black.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75 **Blender Version** Broken: - 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: `211b6c29f7` - 2.90.0 Alpha, branch: master, commit date: 2020-06-06 14:18, hash: `aed11c673efe` **Short description of error** Similar to this report: #40547 Blender can't correctly read EXR files containing only one channel. Files are displayed totally black, even using separate RGB/XYZ nodes or isolating the correct channel in the Image Editor. **Exact steps for others to reproduce the error** In my case: I use displacements maps from Quixel Megascans. Their particularity is that, displacement being only a BW data, they store all the data in the R channel. But the catch is: there are no G or B channels at all. For anyone who uses Quixel's assets, it's quite a big deal since every displacement map is either mono-channel EXR, or BW JPEG which isn't ideal for displacement. Here's a .blend for you to test, it contains two free EXR textures from Quixel Megascans; displacement and normal map; as well as two custom-made EXR files (using Nuke). [EXR_Mono_Channel_Test.blend](https://archive.blender.org/developer/F8589376/EXR_Mono_Channel_Test.blend) If you open the file and just try to play around with the separate RGB in the shader editor or with the channels display in the image editor, you'll see the result is always black using the red only textures, while the full RGB channels ones work correctly. ![image.png](https://archive.blender.org/developer/F8589386/image.png) If you unpack the maps and open them inside another software, may it be a picture viewer or editor, it will display a red and black picture because the BW data is stored in the red channel and most of these softwares will usually recreate any missing RGB channels as black.

Loïc DAUTRY commented

2020-06-07 18:26:58 +02:00

Added subscriber: @L0Lock

Evan Wilson commented

2020-06-07 21:44:42 +02:00

Closed as duplicate of #61607

Evan Wilson closed this issue

2020-06-07 21:44:42 +02:00

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Mono-channel EXR files are unreadable #77574