Adding missing offset ADU value on Light Subs

Harry Zampetoulas

Hello

Long story sort. 
I take some light subs with Gain 0 and Offset 0. (Offset 0 is a wrong value. My camera works fine with offset of 50) 

Now I can't calibrate this data because the darks with 0 offset is useless.

Is any way to Add in the Lights subs a value of 50 Offset so to be able to calibrate them with darks taken with Offset of 50?.

Same target with offset of 50, have median value of 0.01750  (all image) (this is average of multiple images)   

The Subs with the Offset value of 0 have median 0.00195 (this is average of multiple images too)

I try to add the difference with pixelmath ($T+0.01560)  but the result light subs are not calibrated correctly too.

Any Idea?

Thank you 

Harry

BlockHead

An offset  parameter will likely be added in the next update of WBPP.

You can of course add any offset you want to your images with Pixel Math and an image container. 

I would think to discover the offset value you would take "biases" (short exposures) and average those from 0 gain and 50 gain... you wouldn't want to use light frames to make this measurement. 

This is an area I do not know much about though...

-the Blockhead