zanco
Posts: 24
Joined: Fri Dec 07, 2012 1:38 pm

[Solved] -ex auto but images get darker at sunrise ?

Mon Aug 05, 2013 5:57 pm

Hi,

Currently I am playing with the camera module. I am running raspistill in timelapse mode but I notice that the images are getting darker and darker during the time. I start the timelapse at 08:00 AM, image is great. The image at 09:00 AM however is quite dark and the image at 10:00 AM is quite ugly. If the camera module gives those dark images I can stop raspistill with ctrl-c and restart it, at that moment I have nice and bright image but one hour later the images gets darker and darker again. I take images once a minute but the first about 45 - 50 images look good but after that the images get darker, but the outdoor light circumstances get better....

I attached 3 images, with 1 hour difference in time from this morning. My command line is:

sudo raspistill --hflip --vflip -n -t 86400000 -tl 60000 -o image%d.jpg which I run as sudo from a mounted network share
image6.jpg
8 AM
image6.jpg (42.45 KiB) Viewed 808 times
image65.jpg
9 AM
image65.jpg (43.78 KiB) Viewed 808 times
image125.jpg
10 AM
image125.jpg (21.49 KiB) Viewed 808 times
Last edited by zanco on Tue Aug 06, 2013 4:42 am, edited 1 time in total.

User avatar
jbeale
Posts: 3649
Joined: Tue Nov 22, 2011 11:51 pm
Contact: Website

Re: -ex auto but images get darker at sunrise ?

Mon Aug 05, 2013 7:28 pm

There is a known bug causing timelapse images to become darker over time. See this thread:
http://www.raspberrypi.org/phpBB3/viewt ... 43&t=45783

Supposedly, this was fixed on 16 July 2013. Have you updated your firmware (sudo rpi-update) since then?

zanco
Posts: 24
Joined: Fri Dec 07, 2012 1:38 pm

Re: -ex auto but images get darker at sunrise ?

Mon Aug 05, 2013 8:07 pm

Hi, thanks for your reply,

I did not update the firmware (until 20 minutes ago) and now, after a reboot, I restarted the timelapse and will let you know if that solved the dark pictures.

Indeed the pictures from this morning show me that the problem is solved, Thanks for the fast reply !

Kind regards,

Ben

Return to “Camera board”