8
8
A
A
D
D
J
J
U
U
S
S
T
T
I
I
N
N
G
G
I
I
M
M
A
A
G
G
E
E
S
S
SIGMA Photo Pro User Guide
36
Using the Color Wheel to manually adjust color
To manually neutralize a color cast, such as a yellow scene caused by indoor lighting, use the eyedropper in
the Review Window to
sample a color
that represents a neutral gray. Based on the RGB values in the
eyedropper, drag the target ring in the color wheel to set the CMY values so that the RGB values will
equalize. Since the sampled color was known to be neutral, this generally balances the overall color of the
image.
The value of the target ring is represented by units of cyan, magenta, and yellow recorded below the color
wheel, displayed in “CC” (color correction filter units). The chart on the preceding page indicates the
relationship between red, green, and blue, and cyan, magenta, and yellow.
If you feel the image has an overall color cast, and do not have a neutral color to sample, drag the target
ring in the opposite direction of the unwanted color to neutralize. For example, if the image appears too red,
move the target ring towards cyan, on the opposite side of red in the Color Wheel.
Using the Color Adjustment Eyedropper to adjust color
Use the Color Adjustment Eyedropper to let SIGMA Photo Pro create neutral gray tones in
your image. Locate a portion of your image in the current Review Window that includes a
known neutral color that is not rendered as a neutral color. Click on the eyedropper button.
The pointer turns to an eyedropper.
If you wish to redo the gray balance using a different sample point, click on the eyedropper button and
repeat the steps above.
If you do not like the results of the color adjustment, click on the
Reset
button at the bottom of the panel to
return to default (no color adjustment) setting. You can also use the eyedropper adjustment as a base, and
then move the target ring in the color wheel to refine your adjustment.
Place the eyedropper over the color to be neutralized and click. The software
will evaluate that sample and make adjustments to achieve a neutral tone.
Note in this example that the known neutral gray square
was weak in Blue. Once balanced, the Blue value
increased from 147 to 198, and the gray now appears
neutral as in the original scene.
After adjustment
Before
