Interpreting A Histogram; How To Adjust A Histogram - Canon CanoScan FB 1200S User Manual

Interpreting a Histogram

You can select the entire image or specify an area for which a
histogram will be generated. The relative heights of the peaks in the
histogram indicate the concentration of data with the corresponding
brightness values.

How to Adjust a Histogram

To change the contrast in an image, the distribution of data between
shadows and highlights can be adjusted by dragging the shadows and
highlights slider tabs left or right. All the data lying outside (left of)
the shadows cutoff will change to 0 (black) and all the data lying
outside (right of) the highlight cutoff will change to 255 (white). The
examples below show adjustments to improve the contrast.
Image 1
Image with a bias
toward highlights
Move the shadows
slider tab toward the
highlights end.
• Click the
• •
NOTE
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Bright
Portion
Dark
Portion
Entire Image
selector tool in the preview area to deselect the
black or white point eyedropper tool.
Highlight (255)
Shadow (0)
Image 2
Image with a bias
toward shadows
Move the highlights
slider tab toward the
shadows end.
Distribution of
data with a bias
toward highlights.
Distribution of
data with a bias
toward shadows.
Distribution of
data widely
distributed
between shadows
and highlights.
Image 3
Image with well
distributed data
Move both the
shadows and highlights
slider tabs inward.