The nebula layer needs to have more variation in its thickness. Specifically, each nebulae is roughly as thick as it is wide. I decided to use a ppm image to roughly delineate thick and thin areas of the layer.
Each color has a specific gaussian PDF function associated with it, thus clamping the thickness to a specified range of values. Here are the results in just the nebula layer.
In combination with the other 2 layers...
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| gas: 149475, dark: 884284, stars: 6273772, 3.28 min |
With gamma and saturation corrections...
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