Here is probably the fastest, with the least effort, method I have come across for dealing with color casts:
# With the image open duplicate the background and make the duplicate layer the active layer.
# Go Filter > Blur > Average. This filter averages all the color in the image and changes the image to show this averaged color. This color should be a neutral gray. To make it neutral,
# Add a Levels Adjustment layer.
# Click in the image with the middle eyedropper, the midtone eyedropper.
# This adjusts the tones on this layer to neutral gray. Click OK
# In the Layers palette click the eye next to the background copy layer (now adjusted to be gray) to turn if off or hide it.
# The Levels adjustment layers adjusts all layers under it so the adjustments you set to neutralize the background copy layer will be applied to the background, effectively neutralizing the midtones.
# The image should now look color correct.
This method was presented by Tim Grey, he had an earlier method that took a few more steps.
JohnW
From: photoshop-beginners@yahoogroups.com [mailto:photoshop-beginners@yahoogroups.com] On Behalf Of Clayton Swatzell
Sent: Monday, December 17, 2012 3:57 PM
To: Clayton Swatzell
Subject: [photoshop-beginners] Create a grey card in Photoshop
I have put together a short tutorial on creating a ‘grey card’ in Photoshop. This will allow you to set a custom grey point (correct a colorcast).
http://photorambling.cswatzell.com/create-a-grey-card-in-photoshop/
Clay Swatzell
If you hear a voice within you say 'you cannot paint,' then by all means paint, and that voice will be silenced.
– Vincent Van Gogh
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