This content has been marked as final. Show 3 replies
The reported numbers are changing because the camera's internal "auto WB" algorithm is computing different WB results for your different images. The camera tries to estimate the WB using its sensor (or analysis of the scene) but it's only an estimate and as you point your camera in various directions the estimates will change even if the lighting is the same.
So, at least, are these numbers derived directly from the camera's own WB evaluation, or they are a secondary evaluation on behalf of ACR? I suppose it depends on how much Adobe knows about a certain camera's RAW format, so I've mentioned my model.
The numbers depend on the camera profile. CR uses different profiles than Canon's own profiles, so the numbers won't match, say, Canon's software (DPP).
But your original question is about why the numbers are changing from image to image, and this is because of the camera's Auto WB feature reporting different values.
If you set a manual fixed WB in the camera (e.g., switch your WB setting from Auto to Daylight or something that is constant) then shoot a bunch of images in a row using that setting, the WB numbers reported in CR will be the same for those images.