This could be caused by a small nonlinearity or a small DC offset. The offset interacts with AWB gains and CCM, to produce a colour change.
It could be related to any of: Black level, raw image compression, companding, noise.
If it only affects very dark areas, it's probably something happening close to the black point (3072).
If we assume that the sensor's noise is uncorrelated and has zero mean, an offset could conceivably arise from a discontinuity in the companding function around 3072, which would have the effect of "rectifying" the noise.
It might alternatively be something to do with raw image compression (have you enabled this?)
It could be related to any of: Black level, raw image compression, companding, noise.
If it only affects very dark areas, it's probably something happening close to the black point (3072).
If we assume that the sensor's noise is uncorrelated and has zero mean, an offset could conceivably arise from a discontinuity in the companding function around 3072, which would have the effect of "rectifying" the noise.
It might alternatively be something to do with raw image compression (have you enabled this?)
Statistics: Posted by njh — Wed Oct 15, 2025 11:10 am