Iris on a gradient (urmymuse)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Iris Nebula · NGC 7023 · VdB139

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Iris on a gradient

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Iris on a gradient

The first picture I uploaded on Astrobin was the Iris nebula taken with my stock Canon 7D ... i was really pleased with it at the time

The good news is i think this is better ! BUT

I captured a lot of data (for me ) at 11 hours over four nights and was looking forward to processing. When I got going i noticed horrible gradients particularly on the lume and red filters , i think this is caused by local light pollution ie street light but might be wrong

Anyway the usual tools I use in photoshop to get rid of gradients were producing strange results i think because gradient was so strong so had to take a DIY approach using blurring to get a gradient map and then subtracting - i think i have lost some contrast in the process , also stars aren't brilliant and colour calibration was difficult and not best result

other than that its ok !

Lume 660 x 30s

Red 240 x 30s

Green 200 x 30s

Blue 220 x 30s

Equals 11hrs

Yorkshire Astro Imaging
N.I.N.A. Users

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Status	Advanced success
Started	...
Astrometry.net job	4452927
PixInsight job	FR1GIW0LU3SIN10P276YUKODHS44JTDZ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h01m34s.691
RA (top/left)	21h04m15s.575
RA (top/right)	20h54m00s.361
RA (bottom/right)	20h59m03s.418
RA (bottom/left)	21h09m08s.757

Dec (center)	+68°09′43″.65
Dec (top/left)	+68°49′20″.17
Dec (top/right)	+68°10′39″.62
Dec (bottom/right)	+67°29′53″.21
Dec (bottom/left)	+68°07′26″.70

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Iris on a gradient

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