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A-61510 January 2005 2-26
Image header
information
An image header is associated with every image captured by the
scanner. Following is a list of information available in the image
header.
Image length size of the image.
Image identifier indicates whether the image is front bi-tonal,
rear bi-tonal, front color or rear color.
Resolution the scanner records the selected scanner image
resolution in dots per inch.
X-axis upper left pixel horizontal offset to upper left corner of
the image. For more information, see the next section entitled
“Zone processing”.
Y axis upper left pixel vertical offset to upper left corner of the
image. For more information, see the next section entitled “Zone
processing”.
Width the scanner records the number of pixels-per-line in the
image. Width is also referred to as line length.
Length the scanner records the lines-per-page in the image.
Length is also referred to as page length.
Bits-per-pixel bits-per-pixel can equal 1 for bi-tonal imaging.
8 for grayscale or 24 for color imaging. Bits-per-pixel is also
referred to as pixel depth.
Compression type the scanner records the compression
type used. Values for bi-tonal images are: No Compression,
Group III, Group III 2D or Group IV. The values for grayscale or
color images are No Compression or JPEG.
NOTE: No Compression (uncompressed) grayscale or color images
will be available on scanners purchased prior to January
2005.
Polarity the scanner records image polarity. White pixels can
be indicated as 0 or 1.