The Filter module's 'Fringe Killer' mode is an easy and very effective way to remove unsightly blue and purple halos caused by chromatic aberration.
Simply put the offending stars, including their halos in a mask (one can be automatically generated from within the Filter module, by clicking Mask, Auto, Stars or FatStars, Do, Keep). Next click a few times on different parts of the purple or blue halos and they will slowly disappear with each click.
Upon launch, the colour module blinks the mask three times in the familiar way.
This can significantly impact the "correct" (in terms of visual spectrum) colouring of your image.
This guide lets you create starless linear data using StarNet++ and the Heal module.
Please note that other parameters such as the 'Threshold', 'Max feature size', 'Filter sensitivity' and 'Exclude color' have no effect in this mode.
This time set 'Old Mask' to 'Add New To Old' to add the newly generated mask to the mask we already have.
You can convert everything you see to a format you find convenient. Give it a try!