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<blockquote data-quote="pforsell" data-source="post: 492938" data-attributes="member: 7240">As I said, their choice of words has caused a lot of confusion. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool&nbsp; &nbsp; :cool:" loading="lazy" data-shortname=":cool:" />Lossless compressed NEF is lossless, not just &quot;visually lossless&quot;, which is a weasel word. Lossless means the compression is reversible, like a ZIP file in Windows, with no loss/change/mutation to the data. The data is the same (identical bit by bit) with the uncompressed file once the data has been uncompressed ('unzipped') by a raw developer software.Compressed NEF is lossy, but Nikon chose to call it visually lossless which is like calling a cheap wedding ring &quot;zirconium diamond&quot;. Well, zirconium just isn't diamond. This file format loses information irreversibly and permanently, and will never again be identical to the original uncompressed data. By Nikon's standard you may or may not be able to see the difference, depending on how capable you are visually. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue&nbsp; &nbsp; :p" loading="lazy" data-shortname=":p" /></blockquote>

[QUOTE="pforsell, post: 492938, member: 7240"] As I said, their choice of words has caused a lot of confusion. :cool: [B]Lossless compressed NEF [/B]is lossless, not just "visually lossless", which is a weasel word. Lossless means the compression is reversible, like a ZIP file in Windows, with no loss/change/mutation to the data. The data is the same (identical bit by bit) with the uncompressed file once the data has been uncompressed ('unzipped') by a raw developer software. [B]Compressed NEF[/B] is lossy, but Nikon chose to call it [I]visually lossless[/I] which is like calling a cheap wedding ring "zirconium diamond". Well, zirconium just isn't diamond. This file format loses information irreversibly and permanently, and will never again be identical to the original uncompressed data. By Nikon's standard you may or may not be able to see the difference, depending on how capable you are [I]visually[/I]. :p [/QUOTE]

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