msperl
Posts: 325
Joined: Thu Sep 20, 2012 3:40 pm

picam producing strong orange tint

Thu Jul 17, 2014 6:42 pm

Hi!

I have experienced this now quit often:
the rpi-cam does produce images with a very strong orange tint during sunset. (even without direct sun).

While with the naked eye or an iphone camera it has more of a pink touch...

So I wonder if there is anything to do about it?
I guess it is a repeated question, but I have not found anything...

Thanks, Martin

p.s: Note that I use the PyCam interface and standard settings or everything.
Attachments
iphone.JPG
taken with iphone from a slightly different angle
iphone.JPG (27.5 KiB) Viewed 811 times
picam.jpg
RPI Camera image
picam.jpg (31.2 KiB) Viewed 811 times

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jbeale
Posts: 3360
Joined: Tue Nov 22, 2011 11:51 pm
Contact: Website

Re: picam producing strong orange tint

Thu Jul 17, 2014 10:37 pm

might be an overexposure in the red and green channels, because the autoexposure is not tuned for small areas of very bright and very non-white light.

Might also be affected by a strong fraction of infrared near sunset, some of it gets through the IR-cut filter. The camera would record a different color than the eye in that situation, because even with the IR-cut filter, the camera still has more sensitivity to IR relative to the human eye. Maybe the iphone has a better IR-cut filter(?)

msperl
Posts: 325
Joined: Thu Sep 20, 2012 3:40 pm

Re: picam producing strong orange tint

Thu May 05, 2016 3:44 pm

With the new camera V2.1 it looks as if the red/orange tint is gone.

(But there may be some awb issues during cloudy/hazy conditions - more observations are needed -> different thread)

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