D90 is 12-bit camera, so D90 is 12-bit camera, so maximum possible value is 4096. It may be slightly less if 'zero level' (bias) is subtracted by camera. IQ180 is 16-bit, so maximum value should be 64k (and it is in my tests) -- Alex Tutubalin @LibRaw LLC reply
D90 is 12-bit camera, so maximum possible value is 4096.
It may be slightly less if 'zero level' (bias) is subtracted by camera.
IQ180 is 16-bit, so maximum value should be 64k (and it is in my tests)