Color Mixer

Color Mixer is a plugin specifically designed for the Paint.net graphic editing application, which provides you with an RGB color mixer for adjusting the saturation, brightness, contrast and hue effects of photographs.

Setup and interface

The tool's not wrapped in an installation kit. It's based on a single DLL file that can be downloaded and copied to the "Effects" folder of Paint.net's installation directory.
If Paint.net is already running, it may be necessary to restart it to apply changes. From this point on, the "Color Mixer" plugin can be accessed from the "Adjustments" menu. New plugins are indicated via a small icon that resembles a puzzle piece.
The main configuration panel has a simple appearance and it's split into four panes for separately tweaking saturation, brightness, contrast and hue settings.

Adjust the color channels of effects

For each effect it's possible to set the red, yellow, green, cyan, blue, magenta and base channels by moving a slider or by entering the numerical values if you have this exact information at hand. Any channel can be reset to default with one click.
Moreover, you can enable or disable shadows, midtones and highlights, as well as reset all effects to default with one click. Worth noting is that photo modifications can be previewed in real time, so there's no need to apply changes, view the image and undo actions if you change your mind.

Evaluation and conclusion

It remained stable throughout its runtime in our tests, without triggering Paint.net to hang, crash or display error messages. We haven't experienced any stability issues.
To wrap it up, Color Mixer offers a practical solution to all Paint.net users looking to seamlessly tweak each color level of an image's saturation, brightness, contrast and hue effects.