4 replies to this topic

[unbreakable goose]

Hi Everyone,

 

I've been working on a mosaic of the lagoon nebula, and I'm pretty happy with how its going, but there is one problem -- it seems I missed a small portion of the frame when I was doing a pass with one of my filters (I haven't identified which one yet, though). The result is the discoloured corner in the bottom left of the image below (SHO palette).

 

 

 

Is there anything I can do to fix that corner? I don't want to go with a bicolour as I love the look of SHO. 

 

Note -- I do know there are alignment issues with some of the stars, but that isn't my major concern right now (but if you have tips on how to fix that as well, it would be greatly appreciated) 

 

Thanks and clear Skies 

 

 

 

 

[44maurer]

For the bottom left, you could go to a starless image and use a clone stamp to match the discolored area. You didn’t mention what post processing software you are using. 

[smiller]

+1 on the suggestion to just manually repair the starless version with a close stamp tool.   Photoshop like programs (Affinity, PS) can clone stamp using only hue, luminosity, etc and can do so with various blending options.

 

Perhaps doing it in one of the color/luminance color spaces (ex: HSL) may preserve the nebulosity while correcting the color to match the rest of the background and separately you can normalized the luminosity to match.

Edited by smiller, 13 August 2024 - 09:17 AM.

[Borodog]

I did this: https://www.astrobin.com/2e5sfb/

 

:Op

 

As others said, clone stamp the starless image. Or just crop it.

 

By the way the corner is missing in O, the blue channel, as the background is yellow. Red + Green = Yellow. Yellow + Blue = Neutral.

[gcardona]

You could crop out the affected areas to make it look like some of the old Hubble pictures.