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Area of Interest: Image Post-Processing with PixInsight - Color Correction |
updated: 2021-05-25 |
One of 3 different Color Calibration Modes.
In this mode ColorCalibration gathers all pixels of the white reference image within a prescribed range of pixel values, usually defined to prevent inclusion of black and nearly saturated pixels. This mode can be used to select a suitable astronomical object as white reference. In particular, this working mode allows selecting a nearby spiral galaxy to compute a white reference. The integrated light of a nearby spiral galaxy is a plausible white reference, since it provides a sample of all stellar populations and spectral types, and its redshift is negligible. This method has been proposed by PTeam member Vicent Peris, who first implemented it to calibrate a number of deep sky images taken with large telescopes. According to Vicent, ideal calibration galaxies should have the following properties:
- Closer than 50 mpc
- Hubble classifications Sa, Sb, Sc, Scd, SBa, SBb, SBc or SBcd
- Inclination less than 60 degrees
- Integrated intrinsic intergalactic and galactic reddening < 0.5 mag in Johnson B
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