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QuickTime 4 Reference
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Repeated compression of an image with a lossy format (such as JPEG) can cause image degradation.
The DontRecompress flag is used to request that the original compressed data not be decompressed and recompressed, but be copied (possibly with modifications) through to the output file. This is not always possible; circumstances may still force a graphics exporter to recompress.
In QuickTime 4, the JPEG, PICT and QuickTime Image graphics exporters support the DontRecompress flag.
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