Tone Curve And Histogram Palette; Using Tone Curves; Drawing Tone Curves By Freehand - Minolta DIMAGE Scan Dual III Instruction Manual

D
IMAGE SCAN DUAL III UTILITY

Tone curve and histogram palette

Click the tone-curve/histogram button to display the palette.
Auto-setting button (p. 77)
Input shadow, gamma, and highlight sliders (p. 76)
Output shadow and highlight sliders (p. 76)

Using tone curves

Click the arrow next to the channel-list box to
select the channel from the drop-down menu.
To make adjustments to the color balance of the
image, select the appropriate color channel. To
adjust the contrast or brightness of the image
without affecting the color, select the RGB chan-
nel.
The tone curves can be displayed with keyboard
shortcuts. While holding the control key
(Windows) or command key (Macintosh), press 0
(zero) to display the RGB channel, 1 to display
the red channel, 2 to display the green channel,
or 3 to display the blue channel
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IMAGE PROCESSING
Color-histogram button (p. 77)
Channel list box (p. 72)
Tone curve
Freehand curve button (p. 73)
Smooth curve button (p. 73)
White, gray, and black-point buttons (p. 78)
Apply button (p. 78)
Histogram
Input shadow, gamma, and highlight text
boxes (p. 76)
Output shadow and highlight text boxes (p. 76)
Reset button
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.

Drawing tone curves by freehand

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 auto-
matically 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 1
2
2
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