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A-61517 October 2004 2-14
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 data in bytes.
Image identifier indicates whether the image is front bi-tonal,
rear bi-tonal, front color, rear color, front grayscale or rear
grayscale.
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, 24 for compressed color imaging or 64 for
uncompressed color. 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 or
Group IV. The value for grayscale or color images is None or
JPEG.
Polarity the scanner records image polarity. White pixels can
be indicated as 0 or 1.
Multi-Feed indicates whether or not a multi-feed was detected
when the image was scanned. This information could be used by
the host to assist operators during error recovery.