5-10
PowerColor User Guide
Using Tone Controls
PowerColor’s tone controls in Expert mode are accessed by selecting Tone from
the Correction menu. The CMY Tone window (see Figure 5–9) provides a highly
flexible tool to correct color casts in your image and set the input density range.
When making tone corrections in your image always keep the CMYK Probe open
to monitor the changes in numerical values (for more information, see
Understanding the CMYK Probe
in Chapter 4).
Correcting Color Casts
Cast correction is the process by which unwanted color is removed from the neu-
tral tones of an image. PowerColor provides automated and manual controls to
target five points along the tonal range: highlights, quarter tones, midtones,
three-quarter tones, and shadows.
Cast correction is important because PowerColor Press keeps hues and neutrals
separate so that color correction can be performed on the hues without affecting
the neutral areas. Casts are removed by adjusting the Red, Green, and Blue
densities of a selected tonal region. By making the output densities equal or near-
ly equal, the result is a neutral value. This neutral density value is passed
through PowerColor’s gray balance table where the appropriate dot values are
applied.
Some images are intentionally photographed through color filters, which, while
adding artistic effects, also add a color cast to the image. The human eye is
extraordinarily sensitive to shifts in colors in the neutral areas, so cast removal
from the highlights and shadows is of paramount importance.
Note:
Removing too much of a cast from a
heavily casted image may cause undesired
effects.
Summary of Contents for PowerColor
Page 7: ...Preface...
Page 8: ......
Page 12: ......
Page 13: ...Installation 1 1...
Page 14: ......
Page 21: ...Getting Acquainted 2 2...
Page 22: ......
Page 44: ......
Page 45: ...Correcting Images with PowerColor Photo RGB Mode 3 3...
Page 46: ......
Page 63: ...Correcting Images with PowerColor Press CMYK Production Mode 4 4...
Page 64: ......
Page 66: ......
Page 80: ......
Page 81: ...Correcting Images with PowerColor Press CMYK Expert Mode 5 5...
Page 82: ......
Page 106: ......
Page 107: ...Unsharp Masking and Descreening 6 6...
Page 108: ......
Page 116: ......
Page 117: ...Scanning Images to Disk 7 7...
Page 118: ......
Page 125: ...Tips and Tricks 8 8...
Page 126: ......