PI - Deconvolution - artifacts in some stars

[Aramcheck]

Any ideas how to prevent this ringing effect I'm getting on a few stars when using Deconvolution in Pixinsight? Having read Jon Rista's webage, I've used Wavelet Regularization to prevent Deconvolution from affecting the background & am otherwise happy with the Decon... results.

Many thanks
Ivor

 

[david_taurus83]

Should it not be done on an L channel?

[wimvb]

Deconvolution is best done on luminance data, so try this:

Extract L and do deconvolution on this. Process the RGB image without deconvolution, but with maximum colour punch. Then after stretching and post processing, combine them again with LRGB combination.

The easiest way to avoid ringing in bright and overexposed stars is to use a star mask to cover them. If you only see this later on during post processing, you can still repair the star cores. Create a star mask and apply it. Use mlt to remove enough layers so that the ringing is gone. Then sharpen a bit.

[wimvb]

Btw, if this example shows the worst star, then just blur as I suggested.

[Aramcheck]

Thanks folks - much appreciatted. I've opted to extract Lum from the OSC, apply Decon to that & then LRGBCombination.

Cheers
Ivor