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Here's
a color photo:
By changing it into black-and-white in a well-known way - Edit/Adjustments/Desaturate
-, we get this picture:
It is rather insipid and boring. Even worse, the stripes of vegetation
have almost disappeared from the field. This is when color channel
filtering comes into question.
Let's go back to the color original! A few lines below the earlier
menu item, click Channel Mixer (Edit/Adjustments/Channel Mixer).
A window appears. First, select Monochrome at the bottom,
and the photo turns to black-and-white. Supposing you have an RGB
picture, you can set the ratio of the color channels with the sliders
above. The Constant slider below sets the general brightness
of the picture. Keep in mind that too extreme values may result
in a radical amount of color noise.
In this example, I have used the following values:
Red:
+38
Green: +192
Blue: -42
Constant: -40
And
here's the final picture! It has become much more dramatic, expressive,
and interesting:
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