Originally posted by StanT I agree the raw files are just that, raw. Yet how to explain this?
---------- Post added 11-19-17 at 06:03 AM ----------
This only occurs when there is a large amount of red in the image.
In simple words: AE systems tries identify "grey-to-white" areas in the frame to identify color temperature before making shoot by reading data from exposure metering sensor. Exposure metering sensor has restricted number of metering areas (AE sensor contains only 86k RGB pixels in comparing 36M pixels in main sensor in K-1).
Returning to your pictures: there are almost no grey or white colors in your image. AE system tried to find areas where differences between R,G and B levels is minimal to identify them as "grey or white".
P.S.
Of course AE metering algorithm is more complex than in my description. But common idea is there.
P.P.S.
Different vendors may use different additions to algorithms in own AE modules. As I remember, Nikon uses many predictions based on real image database in own algorithms.
Last edited by tregubovav; 11-26-2017 at 11:15 AM.