Canon ScanGear CS-S 4.3 User Manual page 62

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You can also achieve some special effects by manipulating the black-point,
mid-point, and white-point values to the extreme. In the following figure, the
Mid-point has been moved to the right of the White-point, producing a
solarizing effect to the lighter areas of the image.
Although the Special Tone Curves provide the best facility for manipulating an
image for special effects, you can experiment with any of the tone tools.
Sampling a Tone for the Histogram
To sample a tone for the histogram, zoom in as close as possible and sample
the black point, midpoint, and white point from an enlarged section, to make
sure you are sampling the shading you want. This is especially important
when you are adjusting an image with many dark tones and midtones, and it
may be difficult to determine the darkest or brightest spot with the naked
eye.
If necessary, select a section from which to sample, and re-preview the image,
then select the sample.
To sample a tone for the Histogram:
1. Zoom in on the area of the image from which you want to take a sample.
2. Using the Crop tool, select an area of the zoomed-in image from which to
take the sample.
3. Click Preview to re-preview the image. The preview image displays only the
selected, enlarged area.
4. On the Tone tab, select the Eyedropper tool for the Black-point, Mid-point,
or White-point values.
Chapter 5
Scanning Techniques
62
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