Hi all,
I'm attempting to set up some Pi Camera 3 Wide devices as weather cameras, taking photos 24/7 on a schedule. They are working fine during the day, but at night the photos are too dark.
I can manually set an exposure time and the photos are much clearer at night, but of course then they are just completely white from overexposure during the day.
So I'd like to leave the automatic exposure enabled, but just increase the upper limit to somewhere nearer 5-10 seconds.
It doesn't worry me if this makes the overall exposure time slower, as I'm only taking one photo every 15 minutes due to limited bandwidth available at the remote site.
I'm taking the photo with rpicam-jpeg. I can't see any options for extending the maximum auto-exposure time. Is the option there and I'm just not seeing it? I did find a commit from 2022 adding an --exposure=long option, but it doesn't seem to have made it into the latest version distributed with Raspberry Pi OS yet. But even if it does, I'm not sure if it will solve my problem as I don't know what it sets the maximum exposure time to.
I'm attempting to set up some Pi Camera 3 Wide devices as weather cameras, taking photos 24/7 on a schedule. They are working fine during the day, but at night the photos are too dark.
I can manually set an exposure time and the photos are much clearer at night, but of course then they are just completely white from overexposure during the day.
So I'd like to leave the automatic exposure enabled, but just increase the upper limit to somewhere nearer 5-10 seconds.
It doesn't worry me if this makes the overall exposure time slower, as I'm only taking one photo every 15 minutes due to limited bandwidth available at the remote site.
I'm taking the photo with rpicam-jpeg. I can't see any options for extending the maximum auto-exposure time. Is the option there and I'm just not seeing it? I did find a commit from 2022 adding an --exposure=long option, but it doesn't seem to have made it into the latest version distributed with Raspberry Pi OS yet. But even if it does, I'm not sure if it will solve my problem as I don't know what it sets the maximum exposure time to.
Statistics: Posted by Malvineous — Thu Mar 13, 2025 9:36 am — Replies 3 — Views 49