Press Matcher Web User Manual - image2output - Support

Global Color Corrections
Step 3: Create and Edit Gradation Curves
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Step 3: Create and Edit Gradation Curves
Use the GLOBAL COLOR CORRECTION dialog as follows (see Fig. 17-3):
1. Click LOAD if you want to modify an existing gradation curve.
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2. Select the color channel to be modified by clicking the C, M, Y or K
option underneath COLOR. Click YMC to change the C, M and Y
separations at the same time. The curve corresponding to the
selected channel is indicated by large points.
3. Edit the curve as follows:
• To add a new point: Click on the dark area.
To specify the position more precisely, enter the coordinate of the
new point into the X and Y boxes, then click on ADD POINT.
Note that X values can only be set in steps of 1, 5 or 10%,
depending on the STEP option.
• To select a point: Click on it or use the arrow buttons.
The selected point is displayed in dark blue and its coordinate
appears in the input boxes.
• To move a point vertically: Drag it with the mouse.
To specify the new position more precisely, select the point, then
enter the new coordinate into the Y box. You can restore the
point at its prior location by clicking UNDO POINT.
• To delete a point: Right-click or SHIFT-click on it.
Alternatively, select the point, then click on REMOVE POINT. You
can restore the point you have deleted by clicking ADD POINT.
• To make the selected curve linear: Click on 1:1.
• To make all curves linear: Click on ALL 1:1.
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.
A curve saved temporarily (or the original curve) remains visible. The
curve and its points are displayed in a lighter color.
5. You can switch to a different color channel at any time. Having done
so, repeat steps 3 and 4.
When editing the YMC separations, all changes previously made to
separations (except K) are overwritten as soon as you click APPLY.
6. Click SAVE to save your changes, then click OK to close the dialog.
Note: Take care that the gradation curves are even, smooth and steady.
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