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Chapter 4: Color Correction in the CMYK Color Space: Production Mode
4-11
Cast correction is important because PowerColor Press performs color correction
separately on the hues and on the neutral areas. Casts are removed by adjusting the
Cyan, Magenta and Yellow densities of a selected tonal region. By making the out-
put densities equal or nearly equal, the result is a neutral value. This neutral densi-
ty value is passed through PowerColor’s gray balance table where the appropriate
dot values are applied.
Note:
Many images may not contain truly “neu-
tral” points. For these images, it is best to per-
form the following procedure on a grayscale
step wedge mounted next to the image instead
of the image itself.
To correct casts automatically on neutral grays, proceed as follows:
1.
Click on the gray eyedropper in the Control bar.
2.
Move the cursor inside the image or step wedge and click on the point you
wish to define. After you select the point, the eyedropper tool is automatically
deselected.
3.
Check the new values using the Probe.
Setting multiple gray points
The gray eyedropper is unique in that it can set multiple points. Gray points are
made up from the quarter tone, midtone, and three-quarter tone regions. To select
multiple points, hold the Option key down (Macintosh), or the Control key down
(Windows), while selecting each point. Before you select the last point, release the
Option key and click on the point. The tool is then deselected automatically.
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: ......