Issue: Pattern Caused by Unsharp Mask and Perspective Correction of High ISO Photos

[LexB (Lex Bruil)]

Other DXO Photolab optical corrections (Vignette and Distortion correction) also causes banding, see:

Block pattern / banding caused by distortion correction

When I process my astrophotography images then I start with the development of the RAW file using Photolab 5. I do a minimum of processing in PL, only using a part of the optical corrections and Deep prime noise reduction and export them to TIF-files for further processing like stacking and stretching. I know that each step in this workflow can introduce artifacts and that light pollution can amplifly this. But earlier I noticed that PL also causes artifacts like halos around stars and circula…

Vignetting filter causing banding

I use Photolab as my main RAW converter and I’m happy with it. But recently I’ve started with astrophotography and noticed that Photolab isn’t working properly. The raw conversion is causing weird concentric circles in the astro photo’s. Post processing astro photo’s is difficult because of the lack of light, the peak of the histogram is mostly around 1/4. Knowing the difficulties in post processing astro photo’s I’ve searched the internet for possible reasons. I found a post on Cloudy Nights …

Lex