Quote:
Originally Posted by sil
I dont understand why its called "linear"
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It's called linear because the ADU values in each pixel are a simple linear function of the number of photons detected. If one pixel detects twice the number of photons compared to another, then it will report twice the ADU value.
When we stretch the data we destroy this linear relationship because the stretch boosts low pixel values much more than high pixel values. Hence, stretched data is called "non linear."
Cheers,
Rick.