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Grayscale BMP output files are 24-bit, not 8-bit
Open, Confirmed, LowPublic


System Information
Operating system: Windows 10 Pro version 1909 build 18363.476
Graphics card: NVIDIA GeForce 940MX

Blender Version
Broken: 2.81

Short description of error
Properties > Output Properties > Output > File Format is set to BMP and Color is set to BW. Output files are BW, but file-size confirms they are actually 24-bit BMPs with identical content in each color channel. Not a huge problem, because I think almost any software that can read BMPs can read the 24-bit version. But it does triple the file size. And Blender can input 8-bit BMPs, so this is just an output issue.

Exact steps for others to reproduce the error
Minimal example blend file attached.


To Do

Related Objects

Event Timeline

Campbell Barton (campbellbarton) renamed this task from BW BMP output files are 24-bit, not 8-bit to Grayscale BMP output files are 24-bit, not 8-bit.Tue, Nov 26, 1:36 PM
Campbell Barton (campbellbarton) changed Type from Bug to To Do.

While we would accept patches to support this, it's not a bug, marking as TODO.

Campbell Barton (campbellbarton) lowered the priority of this task from Needs Triage by Developer to Confirmed, Low.Tue, Nov 26, 1:37 PM