GenericMappingTools
grdimage [ERROR]: Option -Q: Cannot specify a transparent color for grids when intensities are also used
Description of the problem
In GMT 6.4.0 and earlier, I could use the -Q option at the same time as intensities in the module grdimage.
Since GMT 6.5.0, this doesn't work anymore.
Script that generated the error
(Modern mode, Bash script)
gmt makecpt -T-1/1 -Cgray
gmt grdimage $dem_shade
gmt makecpt -C$cpt $cpt_range
gmt grdimage $img -I$dem_shade -nn+a -Q
Full error message
grdimage [ERROR]: Option -Q: Cannot specify a transparent color for grids when intensities are also used
Expected outcome
I use this code to plot a grid, shaded with intensity, over a shaded DEM.
The grid contain NaN values and the projection is Lambert.
In version 6.4.0 and earlier, I get the following result:
Actual outcome
In version 6.5.0, I have to remove the -Q option and I get the following result:
System information
- Operating system: Debian Bullseye
- GMT version: 6.5.0
Can you make a reproducible example. A small one without unnecessary details an no variable? Just plain commands that can be copy-pasted on Windows.
Hello @joa-quim Here is an archive with a minimal example (script, input files and results): example.tar.gz
I have the same issue with GMT 6.5, which is the version that comes with Ubuntu 24.04. However, manually installing 6.6 fixed the issue for me.
As @jsaul noted, this issue was fixed with GMT 6.6. I just tried it. Therefore we can consider this issue resolved.