Image.save_render saves OpenEXR Multilayer as a regular OpenEXR with no layers #71087

New Issue

Grant Wilk · 2019-10-25T05:39:16+02:00

Grant Wilk commented

2019-10-25 05:39:16 +02:00

System Information
Operating system: Windows 10
Graphics card: (2x) NVIDIA GeForce GTX 1070

Blender Version
Broken: (2.80 release)

When exporting a Multilayer OpenEXR file using Blender's Python API and the bpy.types.Image.save_render function, the image is exported as a regular OpenEXR file with neither layers nor passes.
This is NOT an issue with the way Blender reads Multilayer OpenEXR files because exploring the EXR files with other software yields missing layers and passes as well.

Exact steps for others to reproduce the error

Download and open the attached .blend at the bottom of this file (openexr_bug_24_10_19.blend)
Note that there are multiple passes being rendered (Combined, Z, Mist, etc.) and there are also multiple layers being rendered (View Layer and Composite)
Click "Run Script" in the text editor. This script will render an image, configure its output settings to be a Multilayer OpenEXR, then write it to the same directory that the Blender file is in.
Import the exported OpenEXR (named "script_output.exr") into Blender's compositor either by clicking and dragging it in, or by opening it in an image node
Note that the image is missing the extra layers that should be included (Normal, AO, Mist, etc.)

It may be useful to note that if you actually tear apart the exported OpenEXR file, the only channels included are 'R', 'G', 'B', and 'A'.

Expected behavior, for comparison

In the Image Editor with the rendered image, select Image > Save As and save it somewhere using the settings detailed in the script (Multilayer OpenEXR, RGBA, 32-bit depth, No Codec)
Import the saved OpenEXR in Blender's compositor either by clicking and dragging it in, or by opening it in an image node
Observe how there is an additional "Layer" option in the image node, and depending on the layer that is selected, different passes appear as outputs from the node

It may be useful to note that if you tear apart this OpenEXR file, the channels included are: 'Composite.Combined.R', 'Composite.Combined.G', 'Composite.Combined.B', ... all the way through all of the image layers and passes.

Included Files
openexr_bug_24_10_19.blend

**System Information** Operating system: Windows 10 Graphics card: (2x) NVIDIA GeForce GTX 1070 **Blender Version** Broken: (2.80 release) When exporting a **Multilayer OpenEXR** file using Blender's Python API and the [bpy.types.Image.save_render ](https://docs.blender.org/api/blender2.8/bpy.types.Image.html?highlight=save_render#bpy.types.Image.save_render) function, the image is exported as a **regular OpenEXR** file with neither layers nor passes. This is NOT an issue with the way Blender reads Multilayer OpenEXR files because exploring the EXR files with other software yields missing layers and passes as well. **Exact steps for others to reproduce the error** 1. Download and open the attached .blend at the bottom of this file (openexr_bug_24_10_19.blend) 2. Note that there are multiple passes being rendered (Combined, Z, Mist, etc.) and there are also multiple layers being rendered (View Layer and Composite) 2. Click "Run Script" in the text editor. This script will render an image, configure its output settings to be a Multilayer OpenEXR, then write it to the same directory that the Blender file is in. 3. Import the exported OpenEXR (named "script_output.exr") into Blender's compositor either by clicking and dragging it in, or by opening it in an image node 4. Note that the image is missing the extra layers that should be included (Normal, AO, Mist, etc.) It may be useful to note that if you actually tear apart the exported OpenEXR file, the only channels included are 'R', 'G', 'B', and 'A'. **Expected behavior, for comparison** 1. In the Image Editor with the rendered image, select Image > Save As and save it somewhere using the settings detailed in the script (Multilayer OpenEXR, RGBA, 32-bit depth, No Codec) 2. Import the saved OpenEXR in Blender's compositor either by clicking and dragging it in, or by opening it in an image node 3. Observe how there is an additional "Layer" option in the image node, and depending on the layer that is selected, different passes appear as outputs from the node It may be useful to note that if you tear apart this OpenEXR file, the channels included are: 'Composite.Combined.R', 'Composite.Combined.G', 'Composite.Combined.B', ... all the way through all of the image layers and passes. **Included Files** [openexr_bug_24_10_19.blend](https://archive.blender.org/developer/F7855576/openexr_bug_24_10_19.blend)

Grant Wilk commented

2019-10-25 05:39:16 +02:00

Added subscriber: @remi_creative

Grant Wilk changed title from ~~OpenEXR Multilayer exports OpenEXR instead of OpenEXR Multilayer~~ to OpenEXR Multilayer exports an OpenEXR without layers

2019-10-25 05:40:08 +02:00

Grant Wilk changed title from ~~OpenEXR Multilayer exports an OpenEXR without layers~~ to OpenEXR Multilayer exports a regular OpenEXR with no layers

2019-10-25 05:40:23 +02:00

Zohaib commented

2019-10-25 18:00:07 +02:00

Added subscriber: @Zohaib

Brecht Van Lommel commented

2019-11-05 14:48:35 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2019-11-05 14:48:35 +01:00

These API functions should be changed to use BKE_image_save.

These API functions should be changed to use `BKE_image_save`.

Philipp Oeser changed title from ~~OpenEXR Multilayer exports a regular OpenEXR with no layers~~ to Image.save_render saves OpenEXR Multilayer as a regular OpenEXR with no layers

2020-01-27 11:45:54 +01:00

Rabit commented

2020-09-04 09:35:27 +02:00

Added subscriber: @Rabit

John Einselen commented

2022-02-04 00:28:32 +01:00

Added subscriber: @iaian7

Philipp Oeser removed the

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Image.save_render saves OpenEXR Multilayer as a regular OpenEXR with no layers #71087