Quote:
Originally Posted by RickS
There are lots of ways to determine RGB ratios but I don't think any is a magic bullet.
Some of the ones I have tried include: - eXcalibrator
- using a G2V reference star
- using pre-calculated G2V ratios adjusted for extinction
- roughly lining up the R, G & B histogram peaks
- Unlinked stretch in PixInsight
- ColorCalibration in Pixinsight using a variety of white references (a galaxy, the star field, the whole image)
I didn't find that any of these did a good job in every situation. These days I use whatever gives me a result I like. Sometimes I blend a couple of different versions.
Cheers,
Rick. |
I'm always getting in trouble for my crazy analogies, but it almost sounds like polar alignment. The search for the holy grail of perfection, that isn't ever quite possible!
Rick, I've been in love with "linear fit" within PI recently. I know its not a proper color calibration tool, but it seems to do a great job of getting R, G and B in the same ball park before serious processing begins.