How to create camera noise profiles for darktable

da-phil · February 6, 2022, 5:23pm

Regarding the imagemagick / graphicsmagick, there is already an issue reported on github:

darktable-tools-noise depends on graphicsmagick (imagemagick fork) whereas darkable depends on imagemagick

opened 11:16AM - 03 Jan 21 UTC

scope: software support

**Describe the bug** This has been already mentioned in the ["How to create cam…era noise profiles for darktable" article on discuss.pixls.us](https://discuss.pixls.us/t/how-to-create-camera-noise-profiles-for-darktable/7428/99). When installing `darktable` on Ubuntu 18.04 / 20.04,` imagemagick` is used as dependency [see also DefineOptions.cmake#L13](https://github.com/darktable-org/darktable/blob/master/DefineOptions.cmake#L13). However when installing the `darktable-tools-noise` the forked alternative `graphicsmagick-imagemagick` is required for installation and leads to `imagemagick` to be uninstalled, see ```bash The following NEW packages will be installed: darktable-tools-noise graphicsmagick{a} graphicsmagick-imagemagick-compat{ab} 0 packages upgraded, 3 newly installed, 0 to remove and 0 not upgraded. Need to get 680 kB of archives. After unpacking 5.396 kB will be used. The following packages have unmet dependencies: graphicsmagick-imagemagick-compat : Conflicts: imagemagick but it is not going to be installed Conflicts: imagemagick:i386 but it is not going to be installed The following actions will resolve these dependencies: Remove the following packages: 1) imagemagick-6.q16 [8:6.9.10.23+dfsg-2.1ubuntu11.2 (focal-security, focal-updates, now)] ``` The culprit here lies in [`tools/noise/subr.sh` in line 487 & 494](https://github.com/darktable-org/darktable/blob/master/tools/noise/subr.sh#L487) in which very a very imagemagick specifc command is used to detect whether the noise calibration images are neither over- nor under-exposed. This command however is not compatible with `graphicsmagick-imagemagick`. It gives the following error output during a noise profile generation run: ``` convert convert: Unrecognized channel type (-channel). /usr/lib/darktable/tools/subr.sh: line 488: [: : integer expression expected convert convert: Unrecognized channel type (-channel). /usr/lib/darktable/tools/subr.sh: line 495: [: : integer expression expected ``` **Expected behavior** Because the darktables C code seems to be compatible to both imagemagick and graphicsmagick APIs I'd assume the same for the scripts which use the CLI interface of the aforementioned tool. I'd expect the script to use CLI calls which are either compatible with both tools, or just have a code path for both tools. **Platform (please complete the following information):** - Darktable Version: 3.2.1 and 3.4.0 - OS: Ubuntu 18.04 / 20.04

I also think that the script needs to be updated.