I would like to be able to compare images taken at different shutter speed and ISO.
Typically, one can use an equation such as this one to convert pixel values :
p′ = p( k^2/τK)
, where p is original pixel value, p' is the correrted pixel value, k is aperture, τ is shutter speed and K is ISO.
But it does not work with the Sequoia as you can see. this is three images at the same ISO but at different shutter speed of 6 targets with known reflectance.
Could you explain how to apply the shutter speed and ISO correction?