Launch AutoDev to help inspect the data. Chances are that the image looks terrible, which is - believe it or not - the point. In the presence of problems, AutoDev will show them until they are dealt with. Because StarTools constantly tries to make sense of your data, StarTools is very sensitive to artefacts, meaning anything that is not real celestial detail (a single color bias, stacking artefacts, dust donuts, gradients, terrestrial scenery, etc.). Just 'Keep' the result. StarTools, thanks to Tracking, will allow us to redo the stretch later on.
At this point, things to look out for are;
Make mental notes of any issues you see.
Likewise, a courtesy temporary AutoDev is applied to any narrowband accent data for that same purpose.
It is as close to a post-capture colour filter wheel as you can get.
The Entropy module works by evaluating entropy (a measure of "busyness" or "randomness") as a proxy for detail.
To recap; If a pixel in mask is 'on' (coloured green), then this pixel is fed to the module for processing.
You can convert everything you see to a format you find convenient. Give it a try!