Bright Star Artifacts

[dgbarar]

Attached are crops of relatively bright stars from an RGB image acquired with a ST10 XME.  There are several artifacts on these images some of which I can explain and others which I cannot.  The blue reflection halo is the result of a cover slip over the CCD.  The vertical spikes are the result of diffraction from the cylindrical microlens that are inherent in this design.

What I unable to explain are the orange marks that radiate diagonally from the center of the star.  I have two thoughts of what they might be: 1) artifacts from deblooming or 2) image registration as I have only attempted to used the default pixel interpolation and clamping threshold parameters.

Has any one else had this issue before?

Cheers

[dgbarar]

Hi,

I have developed another possible reason that would be terrific if someone could comment on.  Attached is a JPG of a star through a blue filter.  There are three images attached togeather: no processing, bias sharpening only, and bias/deringing.  The square area around the star following bias application looks a bit like the diagonal orange artifacts on the previous submitted images.  Could what I be observing is differential application of de-reinging on each of the channels.  Just a thought.

Don