Launching the Color module

Color module with dialog asking to set the full mask.
If a full mask is not set, the Color modules allows you to set it now, as colour balancing is typically applied to the full image (requiring a full mask).

Upon launch, the colour module blinks the mask three times in the familiar way. If a full mask is not set, the Color modules allows you to set it now, as colour balancing is typically applied to the full image (requiring a full mask).

The color module showing an incorrectly colour balanced M101.
StarTools tends to come up with a reasonable colour balance by default, but may sometimes need some help if a dataset contains aberrant color information in the highlights. In this case, aberrant color information in the star cores caused the balance to be a tad core tad too green.

In addition to blinking the mask, the Color module also analyses the image and sets the 'Red, Green and Blue Increase/Reduce' parameters to a value which it deems the most appropriate for your image. This behaviour is identical to manually clicking the 'Sample' button where the whole image is sampled.

Stars shwoing aberrant color information.
Aberrant color information due to misalignments/fringing or chromatic aberration, may throw off the initial colour balance.

In cases where the image contains aberrant colour information in the highlights, for example due to chromatic aberration or slight channel misalignment/discrepancies, then this initial colour balance may be incorrect and may need further correct. The aberrant colour information in the highlights itself, can be repaired using the 'Highlight Repair' parameter.