Press Matcher Web User Manual - image2output - Support

Spot Color Simulation
Step 7: Optimize Spot Colors
// WEB«
Note: In certain color areas, a color distance of 5 delta E is not yet visually perceived
as critical, while in other color areas a color distance of less than
5 delta E is perceived as critical already. It is therefore advisable to evaluate
the color distance both visually and numerically.
Fig. 15-16 Gamut Warnings for Spot Color Correction
Lab color
CMYK
device color
http://www.image2output.com
Edited
device color
Optimizing Spot Color Halftones (Manually)
You can create gradation curves to improve the simulation of spot color
halftones. This allows you to correct the midtones, for example.
1. In the SPOT COLOR CORRECTION dialog (see Fig. 15-6), select a spot
color, then click on the GRADATION button.
The SPOT COLOR GRADATION dialog appears (see Fig. 15-17).
2. Select the color channel to be modified by clicking the C, M, Y or K
option underneath COLOR. The curve corresponding to the selected
channel is indicated by large points.
3. Edit the selected curve:
• Click to add a new point.
• Drag a point to move it.
• Right-click or SHIFT-click a point to delete it.
4. Click APPLY to temporarily save all changes made so far. Click UNDO
if you want to restore the curve saved temporarily. If you have not yet
used APPLY, clicking UNDO will restore the original unmodified curve.
5. You can switch to a different color channel at any time. Having done
so, repeat steps 3 and 4.
6. Click OK to close the dialog. You are back in the SPOT COLOR COR-
RECTION dialog.
The number of points defining the gradation curves is displayed in the
INFO column. The letter S stands for solid colors and indicates that
there is color data for the 100% value only.
15-20 CGS Hainburg, Germany 06/17/2011
Image2Output Limited Unit 19 IO Centre Hearle Way Hatfield Business Park Hatfield Herts AL10 9EW
Tel: +44 (0)1707 282 710 Fax: +44 (0)1707 269 764 sales@image2output.com