CHANGING THE TONE CURVES
1 Place the mouse pointer over the tone
curve. Click and drag the curve.
• Each time the tone curve is clicked, a new node
will be attached to the curve. The nodes can be
moved by clicking and dragging.
• The input and output levels of the node are dis-
played as it is moved. The input level (horizontal
axis) refers to the original scan, and the output
level (vertical axis) refers to the correction applied
to the image.
• Any corrections made on the tone curve are
immediately applied to the prescan image.
• By placing the mouse pointer on the prescan
image, the grey or colour level of that point will be
indicated on the tone curve by a white circle.
• The reset button cancels all corrections in all chan-
nels.
CHANGING THE TONE CURVES BY FREEHAND
1 Click the freehand-curve button.
• The mouse pointer changes to the pencil
tool when placed in the tone-curve box.
2 Click and drag the pointer to draw
a new curve.
• Extreme image manipulations are possible
with the freehand curve tool.
3 To smooth a rough freehand
curve, click the smooth-curve but-
ton.
• Nodes will be automatically placed on the
curve and can be adjusted with the mouse.
• With extreme freehand curves, the smooth
curve button may significantly change the
shape of the curve. Press the undo button
to return the the original freehand curve.
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