File Formats - Canon CanoScan N1240U Manual

Appendices
You can select the format of the files in which scanned
images are saved by the Toolbox. This topic explains the
various characteristics of the different file formats.
BMP File
This is the standard Windows bitmap file format. It is
supported by most Windows application programs. This
format is frequently selected when an image file will only
be used in a Windows environment. The ".bmp" file name
extension is generally assigned to this format. Please note
that this format cannot be selected in the Macintosh
version of the Toolbox.
PICT File
This is the standard Macintosh graphic file format. It is
supported by most Macintosh application programs. This
format is suitable when an image file will only be used in
a Macintosh environment. Please note that this format
cannot be selected in the Windows version of the Toolbox.
JPEG File
This is the image format specified by the International
Organization for Standardization's (ISO's) Joint
Photographic Experts Group (JPEG). This format's
compression ratio is its outstanding feature. It can
compress data anywhere from 1/10 to 1/50 its original
volume. However, it utilizes an irreversible "lossy"
compression technique that loses part of the data during
compression. Thus, the file cannot be restored to its
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Contents Index
47

File Formats

original state and is slightly degraded in quality. If you
repeatedly open, edit and save a JPEG file, the loss of
quality will become more noticeable. The ".jpg" file name
extension is generally assigned to this format. This format
cannot be selected when the Image Type is set to Black
and White.
PNG File
The Portable Network Graphics (PNG) format is gradually
gaining wide acceptance as an image file format for web
sites (Internet). This file format is used only for black and
white images. Images are saved in a compressed state, but
it is a reversible compression so that the image quality
remains unchanged when files are repeatedly opened,
edited and saved. The ".png" file name extension is
generally assigned to this format. This format cannot be
selected in the Macintosh version of the Toolbox.
TIFF File
The Tagged Image File Format (TIFF) features a high
degree of compatibility between the various computer
platforms and application programs. Data called a tag is
added to the start of the file, which allows the file to be
expanded. However, this characteristic sometimes causes
the file to contain incompatible data. The ".tif" file name
extension is generally assigned to this format.
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