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Re: Webcams again



On Tuesday 06 February 2007 05:40, Tim wrote:
> On Mon, 2007-02-05 at 18:31 +0000, Anne Wilson wrote:
> > I'm not disputing anything of what you've said, Tim, but there must
> > also be something relevant in the way that an application handles the
> > data.  My webcam can produce quite acceptable colours in ekiga, but in
> > amsn everything has a blue/purple tint.  Since the only thing that is
> > not common to the two situations is the application, it has to be
> > there that there is a problem.  That's why I wanted to find some way
> > of changing the balance.
>
> Hue/tinting as I described was a composite video adjustment, to acheive
> similar effects for other camera types, you'd need the software to
> provide you with the appropriate controls.  It looks like they don't.
>
Brightness and contrast work well, but no, there's no appropriate colour 
control.

> Often webcams will do some sort of automatic white balance.  You can see
> some of them flicking back and forth between presets when images are out
> of range, or when they get confused by coloured scenery.  :-(
>
> You could always try the photographic approach:  Try putting some yellow
> cellophane over the lens.   ;-)
>
Hmm - I wonder how many sweets I'll have to get through to find a yellow 
cellophane wrapper?  :-)

Anne

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