I shoot raw and in the largest bit depth available. Essentially they were putting 14 bits of data and two bits of zeros into 16 bits of storage, and now the data is being written in a manner where the null data is not being stored at all in the uncompressed file. Nikon has already cut file size for uncompressed Z7ii files by changing the way the data is packed. I don't know the size of these JPEG files, but would not be surprised if they were 15 MB, 5 MB, and 1 MB or something similar with the possibility of anywhere from a little to a lot of compression. The JPEG files could be compressed with lossy compression or even reduced in size and it would make no difference to the RAW file. Those files are a large JPEG for a 100% view, a Basic JPEG for thumbnails and routine playback, and a medium view that is somewhere in between. The Nikon files have RAW data, IPTC and other metadata, and three separate JPEG files. There are several places where they can compress files or reduce file size without affecting the NEF. The Z9 has something called High Efficiency * - and Ricci explained that as a level of compression and some minor data loss but at a level where he could not visually observe the loss (but he had not fully tested it yet). Virtually Lossless means something else, and it's probably okay to have an imperceptible amount of data loss. They started with Lossless and I've heard that lossless means that no data is lost but it it compressed. So there's a lot of options and combinations that can be used to select pixel dimensions, crop area as well as how the file is saved and how much memory it takes up on a card or disk. Here's a summary of the Z7 II image sizes in pixel dimensions for shooting in the various raw modes but also for varying in-body crops including DX: That's not a great comparison because whether shooting in full frame (FX) or DX crop mode you still have the option of saving the Large raw, a Medium raw or a Small raw file and the pixel dimensions reduce for those medium or small raw files accordingly. So there's a lot of options and combinations that can be used to select pixel dimensions and crop area as well as how the file is saved and how much memory it takes up on a card or disk.Īnd just to be clear the cropping options actually crop the image which leads to ideas like 'crop factor' or 'reach' for how the angle of view of a given lens changes with the crop but the Medium and Small raw saves use the full frame or whatever crop you have dialed in so going to the Medium or Small raw files do not additionally change the crop factor beyond whatever full frame or crop you have dialed in. IOW, selecting image area (FX, DX, 16:9, 1:1, etc.) is one thing and then deciding how to save that image as a raw file (Large, Medium, Small) is another thing and then to add to that you can chose: Uncompressed, Lossless Raw Compression, Lossy Raw Compression or JPEG and of course you can chose either 14 or 12 bits for the raw files (JPEGs are always 8 bits per pixel). Click to expand.That's not a great comparison because whether shooting in full frame (FX) or DX crop mode you still have the option of saving the Large raw, a Medium raw or a Small raw file and the pixel dimensions reduce for those medium or small raw files accordingly.
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