ORIS PDF Tuner Version 4.4.8 User Manual - image2output - Support

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How to Change Color Gradations
Gradation Changes and Tone Value Corrections
How to Change Color Gradations
1. In the COLOR GRADATION window (see Fig. 25-1), use the MODE function
to toggle between the following modes:
• SPLINE – Gradation curves are defined by setting points
• EFFECT – Gradation curves are defined by drawing lines
• TONE VALUE – Tone value correction (see page 25-7)
The current mode is displayed the status area of the COLOR
GRADATION window.
Note:
Switching to another mode cancels all gradation changes previously
made.
2. Select the color separation(s) to be modified. Click e.g. CMYK to
change all four separations of a CMYK image or click C to change
only the Cyan separation.
For more details refer to Selecting Color Separations (see below).
3. Use the toggle function ALL/SEPArate to determine how curves are
displayed:
• One display area for all color separations – or
• Four display areas, one for each color separation (see Fig. 25-2)
4. Modify the gradation curves. For details refer to
Changing Gradations in ‘Spline’ Mode (see below)
Changing Gradations in ‘Effect’ Mode (page 25-5)
5. If you want to reverse all changes, click RESET in the COLOR GRADA-
TION window. The gradation curves of all color separations become
linear.
6. When finished, press RETURN/ENTER or click .
Selecting Color Separations
First change the overall gradation and then that of single separations, as
changes to the overall gradations will undo changes to single separations.
To change single separations, click the C, M, Y, K buttons (or R, G, B respectively)
at the bottom right of the COLOR GRADATION window.
To change several separations at the same time, select CMYK, CMY or
RGB respectively. When you click one of these buttons, all separations
in question will become identical to the curve corresponding to the cur-
ORIS PDF Tuner Version 4.4.8 User Manual 25-3
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