Saturday, February 12, 2022

processed NGC 2903 in colour

Processed Leo galaxy NGC 2903 in full colour, a Finest NGC target. Captured this data back om 29 Jan '17. And 2 days after that I tried to put it together. I guess I wasn't happy with the results then.

Tonight, I'm happy with the result...

Finest NGC 2903 in colour

FITS Liberator 4, Photoshop CS2. Luminance 60x10, RGB 60x5.


Did you catch that?

FITS Liberator version 4.

Somehow I missed the announcement or notification of the upgrade but in the summer of 2021 the image processor and converter was upgraded from version 3 to 4.

I wanted to give it a try. I put the previously downloaded EXE onto a loaner i5 laptop with Win 10 64-bit and installed it without difficult. After some acclimation (I'll discuss this in a separate post), I had my TIFF images ready to go. Via the NAS, I transferred the files back to John Max and fired up Photoshop.

First cut showed two bad and opposing gradients. Is that what put me off the first time?

Created a synthetic gradient for red and removed it. Same for blue. Then did all the normal stuff, registration, cropping, etc. Nice, flat this time.

Boosted the colours and used a layer mask (first time?) to pump up the region around the galaxy. Those two huge extended spiral arms are quite something.

Still needs a bit of work, a better crop, and there's a bit of a red cast.

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