Use Sunny white balance in the camera.
If you use a filter, you have to shoot a custom white balance with the filter in place.
In DSS, check "Use Camera White balance" in the Raw/FITS DDP settings.
Do not check "set black point to zero" on DSLR frames.
Then stack your images and save as a 16-bit TIFF and be sure to check "embed adjustments in the saved image but do not apply them".
Then you must use a color-managed work flow.
Open the saved 16-bit TIFF in Photoshop and assign sRGB as the working color space.
Your image will open and it will be very dark and low in contrast because it is a linear 16-bit TIFF.
You have to then subtract the sky glow from light pollution or airglow. Your color is not correct.
Then you apply a non-linear stretch to make the data viewable to human perception.
Then you enhance the contrast and color.
Some people will tell you that you don't need to worry about a white point or color management, and while technically true, it is much easier if you do it correctly.
BTW, three separate peaks is ok. Processing the color to align the peaks will make the sky neutral, but it will mess up all of the other colors in the stars and objects in the image. Imagine shooting a beautiful red sunset and aligning the histograms to make the sky gray. Histogram aligning does not produce correct color.
Edited by Jerry Lodriguss, 07 December 2018 - 11:28 AM.