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Hi [USER=138671]@photomike[/USER]

More forum members may jump in with their thoughts (as I am not the strongest expert on frequency separation).

The background as I understand is that the human eye sees luminosity changes with the highest resolution and much less resolution for color.

So when trying to extract frequency components of the image (in particular the higher frequency) the focus is on the luminosity component of the image.

Blurring the color Layer is just to help with focusing on the luminosity.

Yet you have made me curious.  Could you share a link to the frequency separation technique you are using.   I have seen some variations and would like to investigate this more for my own learning as well.

Thanks

John Wheeler