Tadpoles in RGBHOO (Paul Macklin)

Tadpoles in RGBHOO

Revision title: RGBHOO

This image combines 8 hours of RGB (96 x 5 min) and 7 hours of dual narrowband (42 x 10 min), captured at f/7 on an 8" EdgeHD. I'm really pleased at how this combination of RGB and narrowband captures more contrast between the tadpoles and the surrounding ionized gas and dust, but still brings in some of those original rich RGB colors.

Here are my processing details, using AstroPixelProcessor:
<ol>
<li>1. Process RGB alone as normal, including 75% star reduction.</li>
<li>2. Extract and stack Ha.</li>
<li>3. Extract and stack [OIII]</li>
<li>4. analyze stars and register these stacks, and save the registered frames</li>
<li>5. Load the registered frames to combine RGB with the RGBHOO formula.</li>
<li>6. Modify to be closer to the HOO2 formula: 
Set Ha x 1 
Red: 100 
Green: 50 
Blue: 10 
 
Set [OIII] x 1.75 
Red: 10 
Green: 50 
Blue: 100 
 
</li>
<li>7. Use built-in star reduction to reduce size and intensity to 80%</li>
<li>8. Export 16bpp TIFF to photoshop</li>
<li>9. Auto-tone</li>
<li>10. Curve at linear-contrast<li>
<li>11. Slight increase in vibrance (15/15)</li>
<li>12. Mild cleanup in Topaz (1% denoise, 5% sharpen)</li>
<li>13. Auto-tone</li>
<li>14. Curves (linear contrast)</li>
</ol>

B

Title: Ha from 42 x 10 min of dual narrowband (L-extreme)

Uploaded: ...

C

Title: [OIII] from 42 x 10 min of dual narrowband (L-extreme)

Uploaded: ...

D

Title: Processed bi-color from 42 x 10 min of dual narrowband (L-extreme)

Uploaded: ...

E

Title: HOO2 stack of extracted Ha and [OIII] (from 42 x 600 sec dual narrowband)

Uploaded: ...

F

Title: Improved HOO2 (recombined from 42 x 600s dual narrowband)

Description: Here, I tweaked AstroPixelProcessor's HOO2 formula:
Ha x1
Red : 100
Green: 50
Blue: 10
[OIII] x 1.5
Red: 10
Green: 50
Blue: 100

Uploaded: ...

G

Title: RGBHOO

Description: Finally, I put it all together in a modified RGB + HOO2. More details in the main description.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	5437979
PixInsight job	D72VE61SLPQEPN76MHKTX65S1APHF5F3
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h22m49s.430
RA (top/left)	05h21m45s.343
RA (top/right)	05h23m50s.868
RA (bottom/right)	05h23m53s.810
RA (bottom/left)	05h21m46s.925

Dec (center)	+33°29′24″.52
Dec (top/left)	+33°16′27″.83
Dec (top/right)	+33°16′04″.50
Dec (bottom/right)	+33°42′19″.14
Dec (bottom/left)	+33°42′42″.31

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