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EXCERPT page containing first few paragraphs. 2023-06-06 00:20:40

Nikon D800 monochrome

Raw Conversion: Demosaicing and Checkerboarding

Raw conversion is an area where a lot of variation can be seen. Few raw converters support interpreting color camera files as pure monochrome data.

With Adobe Camera Raw, there is no way to tell the software that the file is a monochrome file, and so it is demosaiced as a color image. This has one positive effect: any sensor artifacts (e.g. channel gain) are generally filtered out.

Three raw conversions are shown here. They should not be judged on sharpness and contrast as the sharpening and contrast adjustments varied for all. The key issues are the amount of detail rendered and any undesirable effects.


Digital color cameras “gain up” one channel (maybe two) to account for differences of one color channel versus another (sensitivity). This checkerboarding is seen with the DNG files from the Pentax K3 even in color files! Apparently, supporting a camera means accounting for any channel differential in the raw data.

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Variants AccuRaw, RawDigger, ACR available in full article
Nikon D800M

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