Canon EOS Rebel XT - Manual (Page 66)

3 Setting the Processing ParametersN
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The same effect as using filters with black-and-white film can be
obtained with digital images. A color can be brightened by using a filter
having a similar or same color. At the same time, the complementary
colors will be darkened.
v
When color toning is set, the selected color toning will be applied to the
black-and-white image before being recorded to the CF card. It can
make the image look more impressive.
Select one of the following: [N:None]
[S:Sepia] [B:Blue] [P:Purple] [G:Green]
Filter Effects
Filter Effect
N: None
Normal black-and-white image
with no filter effects.
Ye: Yellow
The blue sky will look more
natural, and the white clouds
will look more crisp.
Or: Orange
The blue sky will look slightly
darker. The sunset will look
more brilliant.
R: Red
The blue sky will look quite
dark. Fall leaves will look
crisper and brighter.
G: Green
Skin tones and lips will look
fine. Tree leaves will look
crisper and brighter.
Toning Effect
Setting the [Contrast] to the plus side will make the filter effect more
pronounced.