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How to Take Great Pictures
 
dated 21/Jan.,2005

Question:
What is the Lossless Rotation of JPEG images?

Answer:
With OLYMPUS Studio, JPEG images can be rotated without having to recompress the JPEG image data. This is called "lossless rotation". Because JPEG is a irreversible compression method in which the data is degraded at the time of compression, when a compressed image is rotated and saved, noise characteristic to JPEG appears in the image. In a lossless rotation, however, the JPEG image can be rotated without being recompressed. If, however, the JPEG image data that is rotated does not have height and width as a multiple of 8, the lossless rotation is not performed immediately. Instead, a dialog box appears, prompting you to select the processing method. You can select either to have the image trimmed and then perform a lossless rotation or have the image rotated normally without being trimmed.

 
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