Reference: The Advanced Image Correction tools 111
Color Correction tool
(Native Color Mode only)
The Color Correction tool changes the hue and saturation of an image. You can
also add a color cast to an image by simply moving the pointer to a particular
place on the Wheel, or you can remove an unwanted color cast by moving the
pointer to a complementary color to balance out the tones. For instance, to
remove a greenish cast from your image, move the pointer in the Wheel to the
"red" portion to neutralize the greenish hue of the image. The Color Correction
tool is available only for RGB and indexed color images.
This lets you change the intensity
of the hues (colors) in your
image. Use Saturation
selectively, because increasing
saturation will increase the
intensity of all hues in the image.
To change the
hue of an
image, move
the pointer in
the color
wheel to its
new color
position in the
wheel.
The Radius field shows the amount of shift towards a particular color and
works in tandem with the Angle field. The Radius range extends from 0
located at the center of the Color Wheel and indicating the least
concentration of color, to 1, located at the periphery of the Wheel and
indicating the greatest concentration of color.
Example: If your angle is 0½ (red on the Color Wheel) and the radius is 1, this
results in an intense reddish cast on the entire image.
The Angle-Radius feature works differently from that of the Saturation bar,
which increases the saturation of all hues in the image without tending
towards any particular color cast.
Angle: This shows the angle
of the pointer on the Color
Wheel as measured in
degrees, and a value can also
be entered directly in the edit
box to move the cursor to any
point in the Wheel.
Example: 0½ corresponds to
the color red on the Wheel,
60½ to the color yellow,
120½ to the color green,
180½ to the color cyan, 240½
to the color blue, and 300½ to
the color magenta.
Picker: The Picker lets
you pick a known
neutral gray shade in
your image and
adjusts it to a closer,
truer gray. The grays
in an image may have
a particular color cast
which can be verified
through the color
information in the
Information window.
A gray that tends
towards a reddish tint,
for instance, will have
its R value skewed
higher than the G and
B values. By using the
Picker on a gray area,
the gray is adjusted so
that the RGB values
become approximately
equal.
