0> In article <[EMAIL PROTECTED]>,
0> Jean-Luc Coulon <URL:mailto:[EMAIL PROTECTED]> ("Jean-Luc") wrote:
Jean-Luc> A nice feature in this case would be to be able to get the
Jean-Luc> white point in an OTHER picture.
Jean-Luc>
Jean-Luc> With digital photography, I use often raw pictures. At the
Jean-Luc> beginning of the shot, I get a picture of a grey/white card
Jean-Luc> which will be the white reference for all the following
Jean-Luc> pictures. If the light conditions change, I get an other
Jean-Luc> picture of the grey chart and so I never mind of the camara
Jean-Luc> white balance, all the wotk is done in post-processing.
Jean-Luc>
Jean-Luc> So it would be nice to be able to open a white reference
Jean-Luc> picture and pick reference from this picture an apply it to
Jean-Luc> the other shots.
I use a script that does this. It's very simple and doesn't deal with
colour management, or extreme colours. It is, however, simple to use -
just select the colour that should be white (e.g. with the picker), and
then run the plug-in. It's particularly handy for your case, because
as long as you have the same selected foreground colour, you can run
the script on many images. Here's the script-fu:
---- cut here ---
; whitebalance.scm
; adjust image white balance based on current foreground color.
; Author: Toby Speight <[EMAIL PROTECTED]>
; Licence terms: GNU GPL v2 or later
(script-fu-register
"script-fu-whitebalance"
"<Image>/Colors/_White Balance"
"Adjust the image colors so that the current foreground color becomes
completely desaturated. In other words, if you have selected a color from the
image that should be white, then this will correct any color cast."
"Toby Speight <[EMAIL PROTECTED]>"
"Toby Speight"
"2005-10-20"
"RGB*"
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0)
(define (script-fu-whitebalance img drawable)
(let* ((color (car (gimp-context-get-foreground)))
(red (car color))
(blue (cadr color))
(green (caddr color))
(mean (/ (+ red blue green) 3.0)))
;; TODO: check for divide-by-zero
(plug-in-colors-channel-mixer
1 img drawable 0
(/ mean red) 0.0 0.0
0.0 (/ mean blue) 0.0
0.0 0.0 (/ mean green))
(gimp-displays-flush)))
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