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Place the mouse pointer over the tone curve.
Click and drag the curve. Any corrections made
on the tone curve are immediately applied to the
displayed image.
Each time the tone curve is clicked, a node is
attached to the curve. The nodes can be moved
by clicking and dragging. The horizontal axis
(input level) represents the brightness levels of
the original image, and the vertical axis (output
level) the change applied to the image.
By placing the mouse pointer on the display
image, the grey or color level of that point will be
indicated on the tone curve by a white circle.
The reset button cancels all corrections in all
channels.
Click the freehand-curve button (1). The
mouse pointer changes to the pencil tool
when placed on the tone curve.
Click and drag the pointer to draw a new
curve. Extreme image manipulations are
possible with the freehand curve tool.
To smooth a rough freehand curve, click the
smooth-curve button (2). 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 to the original freehand curve.
1
2
Drawing tone curves by freehand