Error saving emission volume in a PNG file #87717
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Reference: blender/blender#87717
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System Information
Operating system: Windows 10
Graphics card: GTX 1650
Blender Version
Broken: blender-2.93.0-0f66dbea904f-windows64
Worked: didn't found a working version. Doesn't work in the latest 2.93b or 2.92
Short description of error
Rendering emission volume and then saving it as a PNG file with alpha channel results in a strange noisy black and white image that is different from what is displayed by the render result. I have tried other file types and this seems to be limited to PNG files. I have not tried every file types though.
Exact steps for others to reproduce the error
Volume Emission PNG Bug Report.blend
Render the scene and then save the result as a png. Opening the png will show a different result from what is displayed in the render result window.
Added subscriber: @sigma.17-1
Added subscriber: @rjg
I haven't had time to look at your file, but PNG uses unassociated / straight alpha and thus cannot represent a pixel that is both simultaneously transparent and emissive. You will have to use OpenEXR for this purpose, which uses associated / premultiplied alpha. However, the issue you're seeing might be unrelated to this.
Added subscriber: @lichtwerk
Although it seems generally a bad idea to use PNGs with alpha for emmisive colors, we still have #81199 (Some effects [bloom, smoke, fire, ..] still don't save in PNG with transparent background (occlusion vs. emission)) open for this, will merge these reports
Closed as duplicate of #81199