Adobe expands DNG spec with lossy compression … and why it matters to you
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Adobe has introduced lossy compression to the DNG specification because of the gulf between the size of RAW and JPEG files
Updates to the 1.4 DNG specification include the ability to apply an in-camera crop to an images (such as different aspect ratios) but then "un-crop" the image in post
Multiple stitched files can be combined into a single DNG with "transparent" pixels allowing for undefined areas
Article Summary
While the majority of people use their digital cameras to shoot JPEG files, serious photographers swear by RAW, which offers much increased possibilities in post processing. But while RAW images are of a higher quality than their JPEG counterparts, they also take up a lot more space and require more processing power to work with. That's why Adobe has included lossy compression in the recently announced 1.4 specification for its Digital Negative (DNG) RAW file format.
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