Sorry if I wasn't clear on this - by correct scale I mean every image is scaled by the same factor so that 1 pixel intensity measures the same amount of physical light energy for all images.
After doing some research I found each file has a different value for "baseline exposure", and to convert them back to the same scale one needs to apply following correction:
Sorry if I wasn't clear on this - by correct scale I mean every image is scaled by the same factor so that 1 pixel intensity measures the same amount of physical light energy for all images.
After doing some research I found each file has a different value for "baseline exposure", and to convert them back to the same scale one needs to apply following correction:
intensity = raw_intensity * (2^ baseline_exposure)
After this conversion intensities are now consistent across images.
I still have a few questions though:
- Does libraw expose "baseline_exposure" through API?
- I think above correction should be applied to post processed image, is that correct?
Cheers