Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's nebulae  ·  M 81  ·  M 82  ·  NGC 3031  ·  NGC 3034
M81+M82, Chris Sullivan
M81+M82
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M81+M82

M81+M82, Chris Sullivan
M81+M82
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M81+M82

Equipment

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Acquisition details

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Description

This is my first LRGB image. I had problems with my flats - they corrected the edge gradient, but caused strange streaking emanating in an upside-down V pattern from the top. I'm not sure what caused that. This resulted in some rainbow-like streaks that I wasn't able to completely eliminate. I'm also not all that happy with how the red part of M82 came out. I'm not sure what I can do to improve on that - perhaps add some hydrogen alpha?

Comments

Revisions

    M81+M82, Chris Sullivan
    Original
    M81+M82, Chris Sullivan
    B
    M81+M82, Chris Sullivan
    C
    M81+M82, Chris Sullivan
    D
    M81+M82, Chris Sullivan
    E
    M81+M82, Chris Sullivan
    F
    M81+M82, Chris Sullivan
    G
    M81+M82, Chris Sullivan
    H
    M81+M82, Chris Sullivan
    I
    M81+M82, Chris Sullivan
    J
    M81+M82, Chris Sullivan
    K
    M81+M82, Chris Sullivan
    L
    M81+M82, Chris Sullivan
    M
  • Final
    M81+M82, Chris Sullivan
    N

B

Description: Tried reworking from scratch (including using new flats) to get rid of the weird upside Vs. Still don't know what's causing it.

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E

Description: I found the source of my problem: Light leak in my darks! I reshot them and then restacked each channel and thus had to reprocess from scratch. I didn't crop as much out as before either. I spent a bit more time processing it and am quite happy with the result.

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F

Description: Added about an hour of hydrogen alpha to the red channel. It looks like I blew out the core of M81 though, so I'll have to try processing this again.

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H

Description: Identical to Revision G, but with my histogram fixed (red was too far to the right).

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J

Description: I was able to restore some color to M81 as well as the stars.

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K

Description: Basically the same as J, but with the histogram balanced.

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L

Description: Trying to fix my constant issues with color balance.

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M

Description: Color balance fix take two...

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N

Description: Tried to tone down the green in the core of M81 and bring out Holmberg IX a little more.

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Sky plot

Sky plot

Histogram

M81+M82, Chris Sullivan