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Blue Images on ASI183mcPRO w/ L-Pro Filter

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#1 slabkoff

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Posted 26 May 2020 - 08:17 PM

I'm sure this topic has been covered a bazillion times on CN - however this is the Bazllion and 1 time:

 

I've recently started shooting w/ a ASI183mcPRO astro cam.  I also live outside NYC and have an L-Pro (Optolong) filter on my rig.  All my images are coming up BLUE (expected as the filter is blue). But how do I compensate for this?  On a DSLR, I'd shoot a custom white balance and apply to all frames. Here, I'm stumped.  I shot M13 last night and the entire thing was yellow/green (due to the blue fitlter).  I have no idea how to correct this in PixInsight nor in Photoshop - as the tint is just far too much for a normal correction.

 

Any help would be greatly appreciated.

 

My rig:

AT92mm refractor

ZWO ASI183mcPRO cam

L-Pro Optolong Filter for LP

Processing in PixInsight and Photoshop - had to give up Lightroom due to no XISF or FITS reader for Photoshop/Lightroom

 

Acquistion software is "AstroImager" or "FireCapture". I'm having issues w/ ZWO's native package for other reasons and have stopped using it.

 

Help!

 

Thanks in advance

 



#2 imtl

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Posted 26 May 2020 - 10:12 PM

uploading a raw light frame will be helpful to see what is going on



#3 kingjamez

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Posted 26 May 2020 - 10:21 PM

In Pixinsight:

Process->ColorCalibration->BackgroundNeutralization.

 

Use a preview window to take a sample of the background with no stars. Use that as the reference image. Apply the tool to your image.

 

-Jim



#4 mewmartigan

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Posted 27 May 2020 - 11:18 AM

My images always have a color cast after stacking in Pixinsight. I don't know if its the L-Pro or my flats or light pollution or a combo.

 

Running DBE or ABE will get rid of the cast and then Photometric Color Calibration will fix the colors and neutralize the background.




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