Sh2-301

Sh2-301
7

Sh2-301

Emission nebula, Sh2-301, of Canis Major in a full spectrum HST palette.
SPECIFICATIONS
Telescope ..........................................................................................................................................................................................................................
Telescope
Chi-1
Camera ..........................................................................................................................................................................................................................
Camera
FLI Proline PL9000
Location ..........................................................................................................................................................................................................................
Location
Chile
Date of observation ..........................................................................................................................................................................................................................
Date of observation
12 / 10-14 / 2022
Filters ..........................................................................................................................................................................................................................
Filters
SHO
Processing ..........................................................................................................................................................................................................................
Processing
Maxim DL, Photoshop CS6, Topaz
Credits ..........................................................................................................................................................................................................................
Credits
One-Click Observations processed by JSE
The world’s largest database of astrophotography data is waiting for you! Start now your free trial
Try it free
See all photo
Comments

Spectacular John! I would love to see what is your process is to get these colours. Are you selectively targeting areas with the lasso tool and altering the individual RGB channels in Levels? It's the purple that I have trouble with getting whilst retaining a nice transition.

Reply: 2

Thanks Jonathan. My processing is old school. Nothing high tech, like a dynamic pixelmath expression. I do multiple RGB/SHO combinations. Seldom will one combination provide the most pleasing color for the entire image. If you combine the best colors for each region from several combinations into one image, you can get a nice result. The purple is probably too much magenta, a resultant combination from using increased SII and OIII levels in the RGB combination. Desaturating the magenta in PS will help.

Thanks, Jarmo. In order to achieve a full spectrum HST palette, I do not completely suppress Ha green and, as a result, its secondary colors, yellow and cyan. Otherwise you get a bicolor tan and blue image.