Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1848  ·  IC 1871
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Mosaic - Soul Nebula - IC 1848, Monty Giavelli
Mosaic - Soul Nebula - IC 1848
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Mosaic - Soul Nebula - IC 1848

Revision title: Soul Nebula Mosaic

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Mosaic - Soul Nebula - IC 1848, Monty Giavelli
Mosaic - Soul Nebula - IC 1848
Powered byPixInsight

Mosaic - Soul Nebula - IC 1848

Revision title: Soul Nebula Mosaic

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Description

My first mosaic, you can see the panels don't align very well. I didn't want to crop the lower panel so I left it as it is. Next time I will use the mosaic tool in N.I.N.A. !!

I started with two fully processed images -

Crop all the edges to get rid of the registration artifacts - need clean edges !!!

StarAlignment - We need a template file for each image to register to
    Reference image: pick one of the images - click OK
    Registration Model: Projective Transformation
    Working Mode: Register/Union - Mosaic
        Click 'Frame adaptation'
    Star Matching: May need RANSAC increase - I used 4
    Drag instance to the 2nd frame
    We now have a template !!

StarAlignment - another round of SA
    Reference image: the mosaic created by 1st run of StarAlignment
    Working mode: Register/Match Images
        Check 'Frame adaptation'
    'Target Images'
        Add frames - add the original panels ie ForaxX_1 and ForaxX_2
    Output Images: select an output directory 
    Apply

We now have two panels ending _r - open them
    Each panel is half black and the image intensities etc match quite well
    We don't really need these images so close them !!

GradientMergeMosaic
    Add Files: get the *._r files 
    Type of combination: Average (overlay may work better on heavy nebulas (near seams)
    Shrink radius: start with 5 (handles distorted stars)
    Feather radius: 20 as a starting point (lower for closely matched frames)
    Apply

At this point I did more cropping to clean up the edges, but I left the single largest black area.

Note: GradientMergeMosaic did change some of the blue colors in the lower panel to match the upper panel.  I believe that most people do the mosaic while the images are still linear, but when I did it that way the blues went away.

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  • Mosaic - Soul Nebula - IC 1848, Monty Giavelli
    Original
  • Final
    Mosaic - Soul Nebula - IC 1848, Monty Giavelli
    B

B

Title: Soul Nebula Mosaic

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Mosaic - Soul Nebula - IC 1848, Monty Giavelli

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