Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree

Light Pollution Filter and color balance

astronate
26 Jan, 2017 01:24
I recently started using a Orion Skyglow Astrophotography broadband light pollution filter on an unmodded DSLR and I'm having trouble with the color balance.

Here is a link to a pic of M42, but I feel like it should have more red.  I use PixInsight's Dynamic Background Extraction, Background Neutralization, and Color Calibration and that left me with a washed out image.

M42

I did try to pump up the saturation and that helped some but the emission nebula area is more orange than red.

Has anyone else had color issues with a LPR and DSLR combination? If so, how did you solve it?

Comments and critique are appreciated.

Thanks,
Nathan
VicV
26 Jan, 2017 09:33
Your background still has a small blue/red color cast.

You can try this to balance the color before DBE:

- Open the stacked file
- Extract the RGB channels
- Open statistics and check the 'median' value of each channel and note which channel has the lowest value
- Open the LinearFit tool and select the channel with the lowest median as the reference
- Apply this to the other two channels
- Open the ChannelCombination tool and select all three channels
- Click the ApplyGlobal (circle) button to create a new, channel-matched image.
astronate
26 Jan, 2017 17:00
Thank you Victor!  I'll give that a try.
astronate
30 Jan, 2017 23:11
I took Victor's advice about extracting RGB above and also was very careful using ColorCalibration to only use an area with unsaturated stars for the white reference.
Those two things helped.

I also tried splitting out the L and processing it separately from RGB an then recombining it.  I think I brought out a few more details that way.

Here is the new version: M42
VicV
31 Jan, 2017 10:16
Looks great!
 
Register or login to create to post a reply.