Loaded OpenEXR file is displayed all black in 2.80. Looks fine in 2.79 #66515

New Issue

Dharma Teja Reddy Kasa · 2019-07-07T07:15:26+02:00

2019-07-07 07:15:26 +02:00

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.35

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-05 06:13, hash: 66684bdff3
Worked: 2.79b (2018-03-22)

Short description of error
Compositing Node Tree - reading OpenEXR multilayer file content as black - no colors

Exact steps for others to reproduce the error
Image originally rendered in 2.79. When I load exr file for compositing, it looks fine in 2.79

Same file looks like below in 2.80 build

It's true for many exr's. I've attached single image and blend files to reproduce issue. Find them in following attachment
CompBug.zip

**System Information** Operating system: Windows-10-10.0.17763 64 Bits Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.35 **Blender Version** Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-05 06:13, hash: `66684bdff3` Worked: 2.79b (2018-03-22) **Short description of error** Compositing Node Tree - reading OpenEXR multilayer file content as black - no colors **Exact steps for others to reproduce the error** Image originally rendered in 2.79. When I load exr file for compositing, it looks fine in 2.79 ![2.79.png](https://archive.blender.org/developer/F7570302/2.79.png) Same file looks like below in 2.80 build ![2.80.png](https://archive.blender.org/developer/F7570305/2.80.png) It's true for many exr's. I've attached single image and blend files to reproduce issue. Find them in following attachment [CompBug.zip](https://archive.blender.org/developer/F7570296/CompBug.zip)

Dharma Teja Reddy Kasa commented

2019-07-07 07:15:26 +02:00

Added subscriber: @DharmaTejaReddyK

Robert Guetzkow commented

2019-07-07 12:55:46 +02:00

Added subscriber: @rjg

Robert Guetzkow commented

2019-07-07 12:55:46 +02:00

I've got the same result in 2.79 and the current master build. Both show the broken result. Since loading your .exr file in an external image editing application and saving it as .hdr or .exr doesn't fix it, seems like the alpha hasn't been properly tagged in the file.

Dharma Teja Reddy Kasa commented

2019-07-07 13:30:06 +02:00

It remains true for some renders done using 2.8.
It's not same in all cases but it's random
Let me know if you need more data to debug.

It remains true for some renders done using 2.8. It's not same in all cases but it's random Let me know if you need more data to debug.

Robert Guetzkow commented

2019-07-07 14:30:53 +02:00

Ignore my previous comment, I'm not sure what's going on here. Either Affinity Photo and LuminanceHDR both have broken OpenEXR implementation or Blender creates file that don't follow the spec. Affinity Photo can open the files and reads both RGB layer and alpha, but fails to save the data on export resulting in a blank alpha. LuminanceHDR complains that it can't find RGB data and refuses to load the file altogether. This happens for both your supposedly broken file and .exr files that can be properly read in Blender.

Either way I can't even get the "normal" .exr files saved by Blender to work outside of Blender when they have an alpha channel. That makes debugging a bit more complicated.

Can you share a .blend file that (sometimes) creates OpenEXR files that can't be properly read by Blender?

Ignore my previous comment, I'm not sure what's going on here. Either Affinity Photo and LuminanceHDR both have broken OpenEXR implementation or Blender creates file that don't follow the spec. Affinity Photo can open the files and reads both RGB layer and alpha, but fails to save the data on export resulting in a blank alpha. LuminanceHDR complains that it can't find RGB data and refuses to load the file altogether. This happens for both your supposedly broken file and .exr files that can be properly read in Blender. Either way I can't even get the "normal" .exr files saved by Blender to work outside of Blender when they have an alpha channel. That makes debugging a bit more complicated. Can you share a .blend file that (sometimes) creates OpenEXR files that can't be properly read by Blender?

Philipp Oeser commented

2019-07-08 14:58:50 +02:00

Added subscribers: @brecht, @lichtwerk

Brecht Van Lommel was assigned by Philipp Oeser

2019-07-08 14:58:50 +02:00

Philipp Oeser commented

2019-07-08 14:58:50 +02:00

Hm, I'm getting this trying to import the file in Krita:

The image contains pixels with zero alpha and non-zero color channels. Krita has modified those pixels to have at least some alpha. The initial values will not be reverted on saving the image back.

If I render with a multilayer EXR file Output Node from blender I get those "bad" results if I add an Input to the node called Alpha, but leave this unconnected. If I then plug the Renderlayer alpha into the fileOutput Alpha, it seems fine...

Not sure how to handle the case where alpha is zero but pixels are not? changing alpha_mode to something else then premultiplied also doesnt seem to help here.
a bit on shaky ground, this is possibly not a bug, but will confirm for now and kindly ask @brecht for further guidance...

Hm, I'm getting this trying to import the file in Krita: ![#66515.png](https://archive.blender.org/developer/F7575161/T66515.png) > The image contains pixels with zero alpha and non-zero color channels. Krita has modified those pixels to have at least some alpha. The initial values will not be reverted on saving the image back. If I render with a multilayer EXR file Output Node from blender I get those "bad" results if I add an Input to the node called Alpha, but leave this unconnected. If I then plug the Renderlayer alpha into the fileOutput Alpha, it seems fine... ![BAD_film_transparent_disconnected_alpha.exr](https://archive.blender.org/developer/F7575268/BAD_film_transparent_disconnected_alpha.exr) ![GOOD_film_transparent_connected_alpha_multilayer.exr](https://archive.blender.org/developer/F7575270/GOOD_film_transparent_connected_alpha_multilayer.exr) Not sure how to handle the case where alpha is zero but pixels are not? changing alpha_mode to something else then premultiplied also doesnt seem to help here. a bit on shaky ground, this is possibly not a bug, but will confirm for now and kindly ask @brecht for further guidance...

Dharma Teja Reddy Kasa commented

2019-07-08 19:24:29 +02:00

I'm attaching .blend as requested. One thing to note is output node setup is as follows when exr's were rendered.

If I render with a multilayer EXR file Output Node from blender I get those "bad" results if I add an Input to the node called Alpha, but leave this unconnected
Rings some bell but not sure.
#66515.blend

I'm attaching .blend as requested. One thing to note is output node setup is as follows when exr's were rendered. ![T66515_OutNodeSetup.png](https://archive.blender.org/developer/F7577345/T66515_OutNodeSetup.png) ```If I render with a multilayer EXR file Output Node from blender I get those "bad" results if I add an Input to the node called Alpha, but leave this unconnected``` Rings some bell but not sure. [#66515.blend](https://archive.blender.org/developer/F7577347/T66515.blend)

blender-admin commented

2019-07-17 20:46:04 +02:00

This issue was referenced by eee46769ce

This issue was referenced by eee46769cefe47c9edcc2ac430f212c1e31e7ad5

Brecht Van Lommel commented

2019-07-17 20:57:26 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2019-07-17 20:57:26 +02:00

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Loaded OpenEXR file is displayed all black in 2.80. Looks fine in 2.79 #66515