Canon CanoScan FB 630U User Manual page 76

Glossary
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Glossary
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Index
Grayscale
Grayscale refers to a single-channel image made up of 256 shades
of gray, ranging from white to black, that represent all tones in an
image.
Height
The Height text box contains the height of the current selection,
or, if there is no selection, the maximum vertical output size,
based on the currently selected Paper Size.
Histogram Tool
The Histogram displays the distribution of bright and dark pixels
for each color channel in the previewed image. The Eyedropper
tool on the histogram graph lets you redefine the tonal profile.
You can save the settings for Black-point, Mid-point, and White-
point settings in a histogram file with the extension *.HST.
Image Type
The type of image, such as color or grayscale.
JPEG file format
An image file format developed by the Joint Photographic Experts
Group, as a standard for storing color images in less space, with
the file format .jpg.
Keep Proportions button
The Keep Proportions button affects the selection and the Width
and Height text boxes. When you click the Keep Proportions
button, the image size is maintained in the same proportion
whenever you change either the width or the height.
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