> 1) Sensors record light linearly, but the eyes do not perceive it as 
> such, thus the gamme curve is required. The gamma curve is a standard 
> curve however, and not really sensor specific.
> 2) Because sensors are not 100% reproductions of our eyes and each type 
> is different from another, they record light *slightly* different than 
> our eyes, and therefore each sensor needs a specific profile, which ends 
> up being the input profile for a given camera.
> 
> These two factors are combined in the translation from RAW image to JPEG 
> image. To mention them as three separate factors as you have done 
> (sensor nonlinearity, gamme, and vendoc specific processing) is wrong 
> according to my knowledge. It is possible that I have misunderstood 
> something, if so, please enlighten me.

Why does a OOC JPEG of a Canon not look like the one from a Nikon,
Olympus, Sony etc. ? Because each vendor does the internal RAW
processing different.
The vendors RAW engines (Ken Rockwell calls this "secret sauce")
influence the processing and are the reason for introducing the
vendor/camera specific processing as third factor.

Regards,
Markus

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