How to use Overscan

[tshaug]

Hi everybody,

I'm an novice to PixInsight, so please forgive any "stupid" question.

I have a OSC camera (QHY CCD8 Pro) with overscan area.
When I tried to use the overscan area functionality in PI I first thought that it is sufficient to specify the area only in the light frames. but failed on this (I am getting problems with the geometry)
But I have "discovered" that I have to specify the overscan area for darks, flats and bias frames as well otherwise I am not able to do cosmetic correction and image integration.

For darks and bias I am (mis)using the imageCalibration process to specify the overscan area without any further stuff.

I would like to know if I am doing this correctly?
The second question is does it make sense to use the overscan area even when I take darks?

Thanks
Thomas

[bulrichl]

Hi Thomas,

here https://pixinsight.com/forum/index.php?topic=10900 I gave saome links that may help you to understand the concept of overscan calibration.

Bernd

[tshaug]

Hi Bernd,

thanks for your advice. So I will read the papers.
I was hoping if somebody can tell me if my "process" is generally ok to "calibrate" all types (light, bias, flat, and dark) of images before doing any image integration.  But I guess that is better to understand more of the background 

Cheers
Thomas 

[RickS]

I was hoping if somebody can tell me if my "process" is generally ok to "calibrate" all types (light, bias, flat, and dark) of images before doing any image integration.  But I guess that is better to understand more of the background 

Yes, you need to do overscan calibration on bias, dark, flat and light frames.

[tshaug]

Hi Rick,

thanks for the clarification.

CS
Thomas