Jet Killer is a plugin for GIMP which converts images using the "jet" colormap to a better one (by default "viridis") by using directly the pixel values, without any knowledge about the underlying data.

It can be used as a tool to enhance data visualizations for which the original dataset is unavailable. Use cases include:

• enhancing figures from sources who made an unfortunate colormap choice,
• enhancing graphs for which the original data may be lost,
• enhancing visualizations without having to regenerate it from the original dataset.

If you do not have GIMP installed, you will need to install it. Instructions are available on the officiel website.

Once you have a working installation, install the plugin by following the procedure for Python plugins explained on this page.

The plugin has some dependencies that might not be included with GIMP:

• matplotlib,
• numpy.

In GIMP, Jet Killer can be found under Filters > Enhance > Jet Killer.

The popup dialog let you choose the output colormap for the processing. The input colormap is always supposed to be jet.

You can launch the processing by clicking on the right button, or close the plugin with the left button. You can of course also close the plugin by closing the dialog.

The active layer is taken as input and the output is written to a new layer.

If you have an active selection, only the selected area is processed and the rest is ignored. This can be useful to left axes or titles unchanged. If you do not have an active selection, the entire layer is processed.

All releases of this project are listed on the tag page of this repository.

See CHANGELOG.md for more details on the content of each release.

Jet Killer attempts to follow the Semantic Versioning Specification for its version numbers.

Jet Killer is distributed under the MIT License. See LICENSE-MIT for more details.