Hello,
I am running into a bizarre coloration issue with Makie (GLMakie) with the datashader – this leads to a bright blue color on-screen, while the saved figure is red (as it is in the example).
Additionally, the on-screen color has these unusual tiles in a consistent but not obviously meaningful arrangement where the color is red.
Below is a screenshot from the Taxi data datashader example run in a new temporary session:
While this is the saved output (kindly forgive the sizing issues) with the expected color:
Configuration details below:
julia> versioninfo()
Julia Version 1.11.5
Commit 760b2e5b739 (2025-04-14 06:53 UTC)
Build Info:
Official https://julialang.org/ release
Platform Info:
OS: Linux (x86_64-linux-gnu)
CPU: 32 × AMD Ryzen 9 7950X 16-Core Processor
WORD_SIZE: 64
LLVM: libLLVM-16.0.6 (ORCJIT, znver4)
Threads: 32 default, 0 interactive, 16 GC (on 32 virtual cores)
and
▶ nvidia-smi
Fri May 30 10:02:35 2025
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 570.133.07 Driver Version: 570.133.07 CUDA Version: 12.8 |
|-----------------------------------------+------------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+========================+======================|
| 0 NVIDIA GeForce RTX 3050 Off | 00000000:01:00.0 On | N/A |
| 0% 47C P8 N/A / 115W | 547MiB / 8192MiB | 1% Default |
| | | N/A |
+-----------------------------------------+------------------------+----------------------+
+-----------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=========================================================================================|
| 0 N/A N/A 3508 G /usr/bin/gnome-shell 468MiB |
| 0 N/A N/A 177797 C+G missioncenter 31MiB |
+-----------------------------------------------------------------------------------------+
My question is if this is an issue with the shader in the datashader, an issue with (GL)Makie, or an issue somewhere deeper in the stack (e.g. driver, OS, hardware) and what information should I gather to try and identify it?