Sorry to be a bit slow. How does one acquire the SDSS data and 'enable' it in PI? In my installation the only Photometry catalogue available in the drop down menu is APASS.bob_franke said:For future PCC users, I strongly recommend using the SDSS-DR9 data instead of the APASS whenever possible. The SDSS data are acquired with a 2.5m telescope and the APASS data with a 3.15cm. Also, the SDSS folks are more experienced. Additionally, the APASS staff have freely admitted that some of their data are problematic.
I recently encountered a Southern Hemisphere field-of-view where the APASS data had obviously highly inaccurate (b-v) values. Also, the Sloan g' and r' filters produced poor RGB color correction. In the Northern Hemisphere, the APASS data have always agreed with the Sloan for color correction.
BTW Juan, will the PCC user interface return the RGB values used for the pixel math? I would like to compare with my results. I have no doubt that the PI routines are more sophisticated than eXcalibrator's white-star and linear regression. Also, with direct access to plate solving, the PI process will be easier to use.
But will the results provide a significant difference in the final color? It can take a surprisingly large change in RGB factors to be noticeable in the final image.
Like I said earlier, I am a PixInsight user and find the program exceptional and powerful. I'm looking forward to taking PCC for a spin.