The Pi camera supports spot metering (raspistill -mm spot). Where is the metering spot and how large is it? How can I move the location of the metering spot? (I'm willing to use any camera API that supports this if not possible with raspistill/raspivid.)
Use case:
I'm taking a time lapse during varying lighting conditions (day and night). I can use exposure compensation (-ev option) to get correct exposure under one particular lighting with the default metering, but this setting should be different for each lighting condition. Spot metering would solve this problem if I could move the metering spot above a part of the subject I know will not be changing.
Cross posted on SE, but no answer there.