Canon CS-S 4.3 - Manual (Page 58)

CONTENTS
GLOSSARY
INDEX
58
58
Chapter 5
Scanning Techniques
3. Click the Zoom tool and zoom in on the image. When you select the Zoom
tool, the cursor changes to a magnifying glass.
The plus and minus signs on the mouse indicate that you can
enlarge the image (zoom in) by clicking the left mouse button,
and zoom out by clicking the right mouse button.
By zooming in on the image even more, you can select a more precise part
of the image to scan or work with.
4. Continue alternating between the selection and other tools on the
ScanGear CS-S toolbar as long as you do not click off the selection with
the Crop tool.
Custom Tone Adjustments
The settings on the Tone tab let you make individual adjustments to a variety
of tone settings.
What Do Those Curves Mean?
The curve displayed on the Tone tab represents the values of the preview
image according to the tone tool you are using. You may see multiple curves
of red, blue, and green, depending on the settings on the Tone tab, the color
mode, and the image.
The shape of the curve changes to reflect the current settings of the
Automatic, Contrast/Brightness, Gamma, and Histogram tone tools. You
cannot edit the curve except with the Special Tone Curves tool.
Contrast and Brightness Adjustments
The Contrast/Brightness tools control use the image’s brightest and darkest
tones for its reference in adjusting the overall image in a uniform way.
If you increase an image’s brightness by 10 percent, even the bright parts are
increased by 10 percent. So, if you are scanning an overly dark image with a
wide range of tones, increasing the brightness makes the dark tones more
visible, but the brighter parts may appear faded and washed out.
The contrast control bases its calculations on the image’s dark and light tones
to calculate an overall adjustment. Because the adjustment affects the lightest
and darkest tones, increasing the contrast increases the proportion of bright
and dark tones in the entire image. Decreasing the contrast lessens the
proportion of bright and dark tones in the entire image. This can give the
image a dull, washed-out look.