Canon POWERSHOT PRO 1, User Manual

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Changing the File Format
The recording file format can be switched to the RAW format before
shooting the image.
With the standard JPEG file format, the camera processes images
after capturing them to produce optimal results. The JPEG format
compresses images so that more can be stored on a single CF card.
However, the compression is irreversible, meaning that the original
image data cannot be recovered after processing.
In contrast, the RAW format records the image data as captured by
the camera’s CCD without further processing. RAW images are
compressed, but the compression is reversible* so that a high-
quality image can be obtained from the decompressed file without
any loss of image quality. In addition, although a RAW file is larger
than an equivalent JPEG file, it is still only approximately one-
quarter the size* of an uncompressed RGB TIFF format file, making
it relatively compact.
With standard uncompressed file formats, such as RGB TIFF,
images are processed in the camera and require further processing
by retouching software to adjust the image parameters, which
reduces image quality. With the RAW format, however, the original
data can be used in special software** to adjust the image
parameters (white balance, contrast, sharpness and saturation)
making it possible to maintain the image quality while making
changes. The resolution (3264 x 2448) and compression settings
cannot be adjusted for these images.
* As measured by Canon’s testing standard.
** The bundled software can be used to open or adjust the parameters of
images recorded in the RAW file format. Please consult the Canon
Digital Camera Software Starter Guide Disk for details.
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