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Originally Posted by graham.hobart
Just to clarify, in Star tools use mask /auto/sat for star mask, and flood fill lighter pixels for luma mask -If I understand you there is a way of having two mask sets at the same time? I.E a mask over the galaxy and a star mask?or do you do them consecutively?
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I think what Rowland is suggesting is to use Wavelets just on the Galaxy by creating a mask. Additionally he is suggesting (I think - but correct me if I'm wrong Rowland!) to eliminate any stars that could potentially still be selected in the mask.
You're right Graham that in ST it is sufficient to use the 'flood fill lighter pixels' brush in the mask editor to select just the galaxy (no stars should be selected that way, except maybe some stars that sit 'in' the galaxy).
However, if you would like to further remove any stars (EDIT: from the MASK - not from your image!) afterwards (per Rowland's suggestion), you can click Auto, click the 'Stars' preset, set the 'Old Mask' parameter to 'Subtract New From Old' and click Do. What this does is create a star mask like usual, except it subtracts the newly generated star mask from the mask you had before (e.g. it punches holes in your previous mask where stars are detected). Now you can be sure that just the galaxy is selected without any stars.
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As for my attempts at flattening the background, it is maddening!
Each time I use wipe, (classic luma) and increase the aggressiveness I am getting more gradients/ colour bloom including a fog of green which didn't appear before.
I get to aggressiveness 98% and some of the bloom goes but then so does some background stars!!
I
Any tips?
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I'm at a loss why my version of Wipe works fine with your data and your version is misbehaving!
I'm assuming the steps in the e-mail I sent didn't help? (e.g launch StarTools, Load image, Crop galaxy, Wipe, set 'Top End Treatment' to 'Classic (Luma Mask)', Do.) I end up with the attached image, no further processing.
In 99% of the cases the default settings 'just work' (TM).
So there must be something else going on.
I'm going to send you a link to a 1.2 alpha version - let's see if that solves your problem. It'll have some other perks you will find useful with this particular image (for example a brand new noise suppression algorithm that does wonders for stretching faint signals like these).
Cheers,