I am confused about when and how to specify a Pedestal value during calibration.
First, I noticed that my FITS frames show a “PEDESTAL=-100” header when created with APT (Astro Photography Tool). Did not see this when using Nebulosity for captures. I’m using an SBIG-STF-8300C.
What should I do to handle this properly in PI? Wouldn’t the values used impact the ability of PI to scale darks?
Will it also mean that I can never rely on PI to proper scale darks unless I trust CCD + Driver + Image capture software to provide the right result (pixel values and PEDESTAL)?
Thank you,
Viorel
