Canon CS-S 4.3 User Manual
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Chapter 3
Scanning
Opening a Saved Custom Tone Curve
Use the following steps to open a custom tone curve setting that you saved
previously. Custom Tone Curve files are saved by default in the ScanGear CS-S
device-specific directory, although you may choose another location.
To apply a previously saved curve:
1. Click Load.
2. Select the file name you want to load and apply.
3. Double-click the file, or click Open.
Hints for Editing Custom Tone Curves
You can choose a channel and begin to edit the custom curve with the
automatic curves as a starting point. Keep the following in mind when editing
a custom curve:
• The curve box handles are drawn on a white background to signify
that they are editable.
• The curve end points can be selected and dragged to any point in
the curve.
• You may add points to the curve by clicking anywhere in the curve
box.
• If a point is dragged outside of the curve box, it is deleted from the
curve and a new curve is fit to the remaining points.
• The x and y axes on the curve chart represent the input image color
and output image color. When you add a handle to the curve and
drag that handle toward the white areas, the preview image tones
are adjusted to reflect the change.
• You cannot position two handles on a vertical line, because you
cannot have two of the same x values due to the mathematical
formulas involved in drawing the curves. However, you can have
two or more of the same y values, so you can have several handles
on a horizontal line.
• The least and greatest x values for end points, whether original or
added, cannot be deleted.