Canon Pro90 PowerShot Pro90IS Camera User Guide - Page 60
Changing the File Format - is driver
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Changing the File Format The recording file format can be switched to the RAW format. With the standard JPEG file format, the camera processes images after capturing them to produce optimal results. This 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 is fixed at 1856 x 1392. * The supplied driver software is required to open or adjust RAW images on a computer. Please see the separate Software Starter Guide. ** As measured by standard Canon test conditions. 1 Turn the mode dial to , , or . 2 In the [ (Rec.)] menu, select [File Format]. • See Selecting Menus and Settings (p. 38). 3 Select [RAW] and press the Menu button. • The icon will show in the display panel. 4 Shoot the image. • This format can only be selected in , , or modes. 58 Shooting - Selecting Particular Effects
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