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Selective-color correction is an advanced technique to refine the colors in the image.
A cyan, magenta, yellow, and black channel can be used to adjust the six separate
color groups in the image: red, green, blue, cyan, magenta, and yellow. The black-
level slider controls the brightness of the selected color group.This type of correction
is effective in changing a specific color without influencing any of the other colors in
the image. For example, if the sky looks purplish instead of blue, magenta can be
reduced in the blue color group. See page 2 for a selective-color example.
Selective-color palette
The RGB color model is an additive process that uses the primary colors of light: red,
green, and blue. An additive color system mixes the three colors to recreate the entire
spectrum of light. If all three colors are mixed, white light is produced. Television sets
and computer monitors use RGB to create images.
The CMY color model is a subtractive process that uses the secondary colors: cyan,
magenta, and yellow. A subtractive color system recreates color with pigments and
dyes to absorb unwanted color. If all three colors are mixed, black is produced. Film-
based photography is a subtractive process. Printing technology is also a subtractive
process, but, unlike photographic systems, it requires a black channel (K). Because of
the imperfections of printing inks, cyan, magenta, and yellow cannot produce a true
black when mixed, printers use what is called a four-color process (CMYK) to
reproduce images.
About RGB and CMY
Select the color group to be corrected from the drop-down
menu at the top of the window.
Drag a slider or enter a value in a text box to adjust the
selected color group. More than one slider can be used to
adjust the selected color. Changes will be reflected in the
display image. Click the reset button to cancel any
changes.
Click the selective-color button to open
the palette.