The Global Colour Correction tool allows us to reduce colour
casts that effect the overall image (e.g. whole image appears too yellow
- increase blue). However, it is assumed (and always a good idea) that
the highlight and shadow points have already been neutralised using
either the Histogram tool or Highlight/Shadow pipettes.
The zone bounded by the blue line (see the right hand
screen shot) is where we
can configure increment by which the correction will applied. It has 3
settings: Coarse, Medium (default) and Fine. I find dragging the
"spot" around the colour wheel to be much more effective than
using the sliders. The zone bounded by the red line is where we define
whether the colour correction is applied to the full-scale of the
image, Shadows, Midtones or Highlights.
To make the colour adjustment we can use either the sliders, the "spot"
(LaserSoft call it the Hand)
within the colour wheel or click the coloured dots that surround the
colour wheel. Any adjustments made will also be reflected in the
Gradation Curves dialog as shown below.
Visual Feedback of Colour
Balance Adjustments in Gradation Curves
