Aramcheck Posted January 8, 2022 Share Posted January 8, 2022 I'm attempting to create a mosaic of M31. Any ideas on how to prevent this artifact that appears with GradientMergeMosaic? Thanks Ivor Link to comment Share on other sites More sharing options...
Aramcheck Posted January 9, 2022 Author Share Posted January 9, 2022 I think I've found the problem... Although the surrounding area looks black, it isn't. Replacing these pixels with Pixelmath and trimming the image being joined has eliminated the artifact. Also using Clonestamp to mask out any stars right on the "join" edges. i.e. iif($T<0.0009,0,$T) Cheers Ivor Link to comment Share on other sites More sharing options...
Laurin Dave Posted January 9, 2022 Share Posted January 9, 2022 Hi Ivor.. not an answer to your problem but the script has been substantially updated and improved since it was called GMM ... its now called Photometric Mosaic.. to update you'll need to do a re-install of Pixinsight hth Dave 2 1 Link to comment Share on other sites More sharing options...
tomato Posted January 9, 2022 Share Posted January 9, 2022 +1 for the Photometric Mosaic script, I had real problems with gradients across a 12 panel mosaic, below was my best effort before using the script, the second, with assistance from @Laurin Dave, was after using the tool. 1 Link to comment Share on other sites More sharing options...
Aramcheck Posted January 10, 2022 Author Share Posted January 10, 2022 Thanks folks. I'll have a look at PhotometricMosaic. I've still got a few holes to fill, if skies permit, but using StarAlignment / GMM did a reasonable job in the end - though I didn't spot the pinched stars until I reapplied the Auto-stretch on the 'finished' image. The unprocessed result currently looks like this:- Cheers Ivor 1 Link to comment Share on other sites More sharing options...
Laurin Dave Posted January 10, 2022 Share Posted January 10, 2022 (edited) Hi Ivor.. apologies... GMM is still there (don't know what I was thinking last night) but there is a new script under Scripts ... Mosaic .. Photometric Mosaic which is worth looking at.. superior results and no pinch artefacts Dave Edited January 10, 2022 by Laurin Dave 1 Link to comment Share on other sites More sharing options...
Aramcheck Posted January 15, 2022 Author Share Posted January 15, 2022 Thanks for the heads up on PhotometricMergeMosaic. Because I didn't have the camera angle set correctly, after making the registered panels, I had quite a nightmare splitting them into strips so that PMM had a vertical (or horizontal) overlap it could work with. The results were a lot better than with GMM though & I've learned a lesson! I managed to get some more subs on the 11th, but had to ditch most of them due to dew on the secondary mirror & naff flat calibration. 1st attempt at processing attached. Wish I'd managed to get more time on each panel. From Bortle 8 skies... Cheers Ivor 5 Link to comment Share on other sites More sharing options...
Catanonia Posted January 26, 2022 Share Posted January 26, 2022 Does anyone have any guides on how to use Photometric Mosaic in PI ? Searched YouTube and can't find any Link to comment Share on other sites More sharing options...
Laurin Dave Posted January 26, 2022 Share Posted January 26, 2022 Adam Block worked with the author to develop some videos although not sure they're free.. the script documentation is however very good (for a change!) Link to comment Share on other sites More sharing options...
scotty38 Posted January 26, 2022 Share Posted January 26, 2022 (edited) I assume you looked at the tool's documentation itself as, to me at least, it looks fairly comprehensive? Edit - Noticed that was suggested above already..... Edited January 26, 2022 by scotty38 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now