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.
The Filter module allows for the modification of features in the image by their colour by simply clicking on them.
The AutoMask feature is able to generate a suitable mask in most cases by selecting 'Auto-generate mask'.
The noise signature of the deliberately left-in noise, is precisely shaped to be aesthetically pleasing for precisely this purpose.
Two version of the 'Size Bias' parameter exist; the 'High SNR Size Bias' parameter and the 'Low SNR Size Bias' parameter.
A 'Filter Mode' parameter selects the mode of the filter.
You can convert everything you see to a format you find convenient. Give it a try!