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correcting white balance of a photo?

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inv...@invalid.invalid

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Nov 2, 2009, 5:47:51 AM11/2/09
to
If I have a photo, lets say taken in the snow, it may appear to much
blue.
Then I choose an area on the photo which originally was white (snow
for example or a piece of paper).
A program tells me the RGB values of this white and I can adjust the
photo so that
the RGB values of this white will be "255 255 255" or "200 200 200" or
so.
Or the graphic program whould do that automatically.

Do you know any tool telling me the RGB value of a pixel?
Is there a graphics program doing white balance correction?

Martin

Peter Weilbacher

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Nov 3, 2009, 3:35:38 AM11/3/09
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On 02/11/09 11:47, inv...@invalid.invalid wrote:
> Do you know any tool telling me the RGB value of a pixel?

ColorPicker (http://hobbes.nmsu.edu/h-search.php?key=cpicker).

> Is there a graphics program doing white balance correction?

GIMP can do that. Although I haven't done that with the OS/2
version in a while, so I don't remember if it has this feature.
(But for older versions there was at least a script for it that
did.)
Peter.

inv...@invalid.invalid

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Nov 3, 2009, 4:22:56 AM11/3/09
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> > Do you know any tool telling me the RGB value of a pixel?
>
> ColorPicker (http://hobbes.nmsu.edu/h-search.php?key=cpicker).

Great, thanks!!

Martin

A.D. Fundum

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Nov 6, 2009, 9:09:29 PM11/6/09
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>> Is there a graphics program doing white balance correction?

> GIMP can do that.

PMView too, as demanded by editing the RGB-values.
Color -> Edit palette

A.D. Fundum

unread,
Nov 6, 2009, 9:29:10 PM11/6/09
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>> Is there a graphics program doing white balance correction?

> GIMP can do that.

PMView too, as demanded by editing the RGB-values.
Color -> Edit palette

Dave Saville

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Nov 7, 2009, 4:44:19 AM11/7/09
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On Sat, 7 Nov 2009 02:29:10 UTC, "A.D. Fundum" <what...@neverm.ind>
wrote:

But what about the OP's other question? Is there a program that will
tell you the RGB of a selected pixel? I needed one the other day.
--
Regards
Dave Saville

A.D. Fundum

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Nov 7, 2009, 7:58:25 AM11/7/09
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> But what about the OP's other question?

Already answered by Peter, including the URL: ColorPicker

It displayed the color, in hex, of the pixel the mouse is pointing at,
e.g. "Color: #CCCCCC" for the background of my eCenter buttons.

A.D. Fundum

unread,
Nov 7, 2009, 9:38:50 AM11/7/09
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>>> Is there a graphics program doing white balance correction?

>> GIMP can do that.

> PMView too, as demanded by editing the RGB-values.

Or by adjusting the RGB balance, and so on. Adjusting individual
colors (ColorPicker) may be a lot of work, because 'white snow'
aren't all 0xFFFFFF-pixels.

Dave Saville

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Nov 8, 2009, 11:45:09 AM11/8/09
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On Sat, 7 Nov 2009 12:58:25 UTC, "A.D. Fundum" <what...@neverm.ind>
wrote:

> > But what about the OP's other question?

Ha, thanks - missed that.
--
Regards
Dave Saville

baden.ku...@gmail.com

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Nov 15, 2009, 1:53:12 AM11/15/09
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Use PMView. There is not a direct way to adjust the
White Balance, but use "Color RGB Balance" and first
adjust the red slider a few notches to get what is
desired, and apply almost the same adjustment to the
blue slider in the opposite direction. You should not
normally require a green adjustment.

I hope this helps,
lin Baden

>
> Martin

inv...@invalid.invalid

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Nov 15, 2009, 6:34:54 AM11/15/09
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> Use PMView. There is not a direct way to adjust the
> White Balance, but use "Color RGB Balance"

This is what I currently do and I find it very difficult to get white
really white.

JMS

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