Launch the Color module.
See if StarTools comes up with a good colour balance all by itself. A good colour balance shows a good range of all star temperatures, from red, orange and yellow through to white and blue. HII areas will tend to look purplish/pink, while galaxy cores tend to look yellow and their outer rims tend to look bluer.
Green is an uncommon colour in outer space (though there are notable exceptions, such as areas that are strong in OIII such as the core of M42). If you see green dominance, you may want to reduce the green bias. If you think you have a good colour balance, but still see some dominant green in your image, you can remove the last bit of green using the 'Cap Green' function.
StarTools is famous for its Color Constancy color rendering. This scientifically useful mode shows colors (for example nebula emissions) in the same color, regardless of brightness. However, if you prefer the more washed out and desaturated color renderings of older software you can use the Legacy preset.
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Bin the image up until each pixel describes one unit of real detail.
Worry not; subsequent processing in StarTools will remove the color bias, while restoring and bringing out detail.
StarTools' Detail-aware Wavelet Sharpening allows you to bring out faint structural detail in your images.
You can convert everything you see to a format you find convenient. Give it a try!