Perhaps I didn't explain it right. The white balance works when you take
the picture to take any color cast out of the picture. So unlike film with
a digital camera you can bounce a flash off a light green wall or off colored
ceiling and you won't pick up a green color cast in your subject as the camera
automatically sets the Kevin temperature. Putting a gel over a flash that cover
the whole scene is the same as changing the Kelvin temperature of the scene. Now
if you using a flash and gel on just part of the scene that is another
story.
Roy
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