D3X vs 5D2 - myth and reality

Started Jan 26, 2009 | Discussions thread
OP GaborSch Veteran Member • Posts: 7,203
Measuring linearity

ejmartin wrote:

That was the point of my reply. If the D300 RAW level were not
linear in the incident photon flux, the plot that I posted would not
be well approximated by a linear fit to the data. I thought you were
claiming that Nikon raw data was "never linear without an adjustment".

I'm afraid I can't use this as a proof. Bob's question

I'd be interested to know how you measure the non-linearities without a known and calibrated illuminant

was justified. I verify the linearity of the pixel values on the pixel values.

The Kodak gray scale may or may not be reliable (I don't know its calibration values), but it can be used as a relative measure . The D3X image shows 0.25 EV greater difference between the strip A and 18 than the 5D2 image (measured @ ISO 100 and 400).

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