At this point, our image should be looking pretty good, although the colors might be a bit dull.
This is where color saturation comes in. It allows us to increase the intensity of our colors, as individual channels or as a whole.
In order to protect the stars, we need to apply and invert our star mask to our image
We can now safely use curves transformation to gently increase the color saturation without impacting star color.
Color saturation helped improve the overall color of our unstretched image.
The next step is leave the linear processing state and permanently stretch the image.