how to use the lens module now that colour comes much later?

Questions and answers about problems with the software, modules or functionality.

how to use the lens module now that colour comes much later?

Postby almcl » Mon Dec 02, 2019 5:35 pm

Been processing my first ever bi-colour image and, perhaps due to slightly misaligned stacking in DSS and slight rotation of camera between filters, the blue and red bits don't quite line up.

Previously I would try and sort this using the Red/Blue X and Y shift in the Lens module, but aside from not being able to see the colours now at the early stages of processing (which I believe is where the lens module works best) I don't seem able to move the blue and red channels relative to each other.

Anyone else met with this?

Here's a blow up of an area of the image:
red_blue shift.jpg
red_blue shift.jpg (40.88 KiB) Viewed 141 times
Skywatcher 200P with an astro modded Canon 700d, cls ccd filter, field flattener, guided by OAG, ASI 120, PHD2
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Re: how to use the lens module now that colour comes much la

Postby admin » Mon Dec 02, 2019 11:18 pm

First off, would there be any way to fix this while stacking? (e.g. if using DSS, try "Align RGB Channels")

Second, remember that - thanks to Tracking - you can use the Restore functionality to restore the dataset to its linear ("original") state at any time with some operations intact (e.g. Crops, Wipes, and Lens shifts).
Just like you can use the Restore functionality in combination with AutoDev and Wipe to see what you're doing, you can also use the Restore functionality in combination with AutoDev+Color to see what you're doing when using the Lens module, then Restore the dataset to its 'Original' state.

So to recap;
  • AutoDev to see what you're doing
  • Wipe if you need to to see the color changes
  • Color
  • Lens
  • Then Restore to Original state
  • Now process your fixed up dataset as normal

Any trouble, let me know!
Ivo Jager
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Re: how to use the lens module now that colour comes much la

Postby almcl » Tue Dec 03, 2019 3:25 pm

Thanks, as always, Ivo.

I tried to get DSS to stack with color alignment but it didn't make any discernible difference.

However, when reprocessing I used the duotone tab in the color module and things improved quite a bit. In the (heavily cropped and expanded) image below, the original, misaligned, image is on the left and the one using duotone is on the right.

They were processed slightly differently, but the colour fringing has gone almost completely!

side by side.jpg
side by side.jpg (36.03 KiB) Viewed 111 times


I think the overall result (again, cropped and reduced) is better as well:
NewComposite3.jpg
NewComposite3.jpg (88.04 KiB) Viewed 111 times
Skywatcher 200P with an astro modded Canon 700d, cls ccd filter, field flattener, guided by OAG, ASI 120, PHD2
almcl
 
Posts: 114
Joined: Wed Jan 21, 2015 7:15 pm
Location: Shropshire. UK

Re: how to use the lens module now that colour comes much la

Postby admin » Wed Dec 04, 2019 12:48 am

That's a lovely Veil Nebula! :thumbsup:
The Duoband preset button uses rather aggressive desaturation settings, in combination with the "Artistic, Not Detail Aware" style which also progressively desaturates colouring in the highlights.
All up, this keeps the Color module from trying to recover colouring in the highlights. It's definitely helping here!
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