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Chapter 5: Color Correction in the CMYK Color Space: Expert Mode
5-11
Tone Curves
The primary tools in the CMY Tone window are the tone curves and the highlight
and shadow value fields. They are a powerful way of correcting casts in very spe-
cific tonal regions of your image. The CMY drop down menu above the curves
activates the Cyan, Magenta,or Black curve in the graph, respectively.
The horizontal axis of the graph represents the input density. The vertical axis
represents the percentage of output density.
The points on the curve (called “anchor points”) are, from left to right, located
at the following values: highlights, quarter tones, midtones, three-quarter tones
and shadows. By selecting an anchor point and dragging it up or down, you can
alter the amount of the selected color in that tonal region.
The black lock icon at the bottom left-hand corner of the grid is open by default.
By clicking on it, the anchor points on the curve are locked into position so you
can move each of the points individually without affecting the position of the
others. Locking the curve also creates additional anchor points allowing you to
fine-tune the curve further.
Figure 5–9
CMYK Tone window
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...
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Page 125: ...Tips and Tricks 8 8...
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