Jump to content

1912116577_Solarchallenge2022banner.jpg.913a200cf105ddeae9f37765cb1d0c73.jpg

Pixinsight - GradientMergeMosaic artifact


Recommended Posts

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

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

 

  • Like 2
  • Thanks 1
Link to comment
Share on other sites

+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.

M31twelevepanel_Lum_lpc_8thdegLNC_4its_30_MBB-Luminance-session_1-mod-lpc-lpc.thumb.jpg.f7df1ca82ca23b0f200301d9c1d0ea61.jpg

Mosaic_1_2_3_4_5_6_7_8_9_10_11_12_STF.jpg.2116f4ccbab3eaa9651e73f799483b49-mod.thumb.jpg.34a5b2260e27a1ce64ecce8c809c4a1a.jpg

  • Thanks 1
Link to comment
Share on other sites

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

m31_rough.jpg

  • Like 1
Link to comment
Share on other sites

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 by Laurin Dave
  • Thanks 1
Link to comment
Share on other sites

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

M31_v1.jpg

  • Like 5
Link to comment
Share on other sites

  • 2 weeks later...

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 by scotty38
Link to comment
Share on other sites

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 account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.