Using Micro Curves to Increase Contrast and Reduce Background and Core Brightness

Initial stacked and stretched image of M51.

Step 1

Background reduced without any change to the midtones and highlights since the micro curve was applied only to the range form 0.0 to 25976.0.

Step 2

Micro curved applied to just the hightlights to reduce the core and increase contrast.

Step 3

A weak reduction is applied to luminace range [0.0, 25261.0].

Step 4

Mild background smoothing operation applied to luminance range [0.0, 7678.0] with feather radius 3130.

Step 5

The corrected image of M51 right has smaller core and much better contrast without loss of the faint outer area of the galaxy.

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