No Steve, I haven’t run PCC yet on that image. Once I do that with background neutralisation ticked everything will look fairly normal. It’s usually quite good with a nice dark background and most stars looking quite good. That is, unless I’ve used too long an exposure for the brightest stars, in which case I’d prefer PCC to include them when assessing the colour calibration.
In order to do this, according to the Pixingsight resources help, I should reduce the saturation slider to below the readout of the lowest channel. However the read outs are too low to do this, being below 0.2, which is what the image is there to show. My guess is they’re too low because I’ve used the CLS filter, & without it the readout for all three channels of the saturated star would be fairly balanced but much higher, as per the example in the PCC resources page.
I was hoping someone could clarify if this is the case or not, and whether PCC s affected to much by use of a CLS filter.
OK I think I understand. The PCC is working OK, but, some of the stars don't look very good after the PCC process.
I believe the problem may be that some of your stars are saturated. PCC won't fix saturated stars. However, there is a script named
Repaired HSV Separation (found at Script/Utilities/Repair HSV Separation). Use this script
before using PCC.
Here is how it works.
1) Select your stacked image then open the script.
2) Click on the OK button to run the script.
3) Open the
ChannelCombination process and select the HSV Color Space.
4) Click on the little folder icon to the right of the H, Sv, and V dropdown windows and accept the default choices.
5) Click the Global apply button (round button at the bottom) to combine the channels.
This process will create a new image with the saturated stars "repaired". Sometimes it works quite well, and, maybe it will help with your saturated stars.
Hope this helps.
Steve
