Quote:
Originally Posted by lazjen
I tried the RangeSelection but it seemed to include the stars as well. They came in to the selection much quicker than the nebula.
|
Usually the stars are brighter than the nebulosity so you can drop back the Upper Limit to exclude them and lift the Lower Limit to exclude the background.
Quote:
Originally Posted by lazjen
I think I understand your second sentence - the multiply is the mask rendering mode, right?
|
RangeSelection gives you a binarized mask where every pixel is 0 or 1. If you want to mask the RangeSelection area but want the mask to vary depending on the luminance of the unprotected area you can just use a PixelMath expression like "range_mask*luminance_mask". The result is 0 in the areas where range_mask is 0 and it is the same as the luminance_mask in areas where range_mask is 1.
Quote:
Originally Posted by lazjen
In my attempt I used the mask on the clone to actually wipe out the stars before then using that resulting image as the mask to the rgb image. Did I really need to do that or do masks "chain" through images?
|
You can only apply a single mask to an image and you can't chain them together. I frequently build masks using PixelMath, e.g. a clipped luminance mask with stars removed is good for applying HDRMT and LHE without bloating stars. It would also be good for colourizing a Ha image
Cheers,
Rick.