The Amazing D200.

Started Jun 13, 2013 | Discussions thread
olliess Senior Member • Posts: 1,349
Re: Scientists not convinced by CMOS develop Scientific-cmos

Stacey_K wrote:

olliess wrote:

After all, the main physical principle of both sensors types is the same: photons are received in a photosensitive area, which converts the photons to charges, and then the charges need to be counted.

OK here is something else to think about on the whole "color blind" argument.

Would you say black and white film is color blind? It only records either black or white just like the sensor under the bayer filter correct?

If you don't think B&W film is color blind, why should we assume a sensor is?

In the sense: can B&W film distinguish colors as human eyes do? Then no, it cannot, and neither can a bare sensor.

BTW I know various B&W films have different sensitivities to different colors even though they only record as B&W. I can't believe all imaging sensors under the bayer filter have the same spectral sensitivity.

They are not assumed to have the same spectral sensitivity; in fact, a CCD and CMOS will typically not have the same spectral sensitivity at all. However, both are relatively smooth functions in the range that we're interested in, so the camera manufacturer has some freedom in adjusting the Bayer filter to produce the desired red/green/blue responses.

Visual differences in color output seem much more dependent on the choices of R,G,B responses and the mapping of those values to output colors (as Trevor also discusses in the post above). Tests by DxO and other sources show that the underlying sensor can produce hugely different color responses in different cameras -- much larger than the differences between, say, the D200 (CCD) and the D2x (CMOS).

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