On Jun 6, 2013, at 10:17 AM, edmund ronald wrote:
I did some quick tests some years ago and never saw any non-linearity as long as one stays well below saturation. It is possible that recent cameras have shoulders - on the other hand, CC errors might come from optical crosstalk between channels - light diffusing inside the sensor.
You are right in more than one way :) The linearity of the sensor should be also discussed in relation to the response to colour. Suppose we have a monochromatic beam of the wavelength that aligns with the maximum of sensitivity striking the sensel at the right angle. We may see linearity of the response in the range of 8 stops. Add a second monochromatic wave to the same beam, with the wavelength that gets 1/32 (minus 5 stops) response. Now if we decrease the intensity of the combined beam 5 stops, the second wavelength gets no response, or the response will be on the non-linear portion, or it will be lost in flare. -- Best regards, Iliah Borg