7D has banding in shadows, raw2dng solves it only on highlights (the first one is a black offset per-column, the second one is a non-uniform amplification - each column has a slightly different amplification factor).
http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/index.html
(first is 3, second is similar to 5, but per-column rather than per-pixel)
Thank you so much for this link. So, it's possible, at least to getout/attenuate the banding/pattern noise.
"Fixed pattern noise can be removed. By making a template from the average
of 16 identical blackframes and subtracting it from the image most of the fixed pattern noise is removed...
The residual variable component of pattern noise consists in this example largely of horizontal banding noise."
My dumb questions is:
-I take 16 black frame pictures with the cap on but then how i process the MLV file for process the subtracting?
-If i take this 16 photos/blackframes for subtracting and get out the noise pattern, can i use this for other 7D models? Or witch one have there own noise pattern?
What i can see for a easy solution/workflow is some kind of GUI with/in MLV that you can upload the 16 photos for subtracting, no?