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IC5070 Bicolor Experiment

Technical card

Resolution: 1510x1125

Dates: July 13, 2017July 30, 2017

Astrodon Ha 1.25" 5nm: 60x180" (gain: 139.00) -10C bin 1x1
Astrodon OIII 1.25 3nm: 80x180" (gain: 139.00) -10C bin 1x1

Integration: 7.0 hours

Avg. Moon age: 12.57 days

Avg. Moon phase: 65.02%

Mean SQM: 19.00 job: 1675699

RA center: 312.833 degrees

DEC center: 44.364 degrees

Pixel scale: 2.976 arcsec/pixel

Orientation: 179.236 degrees

Field radius: 0.778 degrees


This is an experiment I have been playing with in Photoshop.

I took this Ha an OIII data for IC5070 and tried the traditional HOO blending and wasn't really happy with the results. Even after some herculean color shifts with SelectiveColor in Photoshop it just wasn't giving me what I wanted.

So instead I created these layers in Photoshop:

- solid color layer with a golden color and Ha as mask
- solid color layer with a bluish color and OIII as mask
- solid color layer with a rust color and difference of Ha and OIII as mask
- solid black layer as base

I then adjusted the opacity of the layers to blend the colors I wanted in the image.

I used Curves on the masks to further tweak the color strength.

Then followed with some SelectiveColor layers to tweak the color. I didn't have to do very much at all since I was blending the primary colors from the start.

I'm sure this has been done this way before but I'm not familiar with it - would love to learn more if this is an existing method.






Cleaned up some star halos.

Sky plot

Sky plot


IC5070 Bicolor Experiment, mikefulb