Canon PowerShot S45 User's Guide download pdf (Page 58)

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 (2272 x 1704) 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 Software Starter Guide for details.

Turn the shooting mode dial to , , , or .

Press the / /

button.

Select L* (2272 x 1704) using C or D on

the multicontroller.

* The current setting is displayed.

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Canon PowerShot S45 User's Guide Page 58