AlphaWorld
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From DPReview
Sony a7 IV gets new Lossless Compressed Raw sizes, improved Eye AF & more in 1.1 firmware update
Sony a7 IV shooters can now capture Lossless Compressed Raw images in two new sizes: small (8.2 MP), medium (14.2MP). Sony has also improved Eye AF and added a new Touch Shutter function.www.dpreview.com
Edited to add: Affinity Photo recognizes them, Darktable doesn't, yet, although it's promised at the next release. I'm also hoping they add the noise profiles for the A7 IV so I can use their excellent profiled NR.
Not the first time DPReview has phrased something badly. It's also possible that it's merely a mis-translation from the Japanese.
Fact is, I have compared the files sizes, and they are not reduced BY 60-70%, but TO 60-70%. Fact, not theory. The A1 uncompressed files are about 100MB. The lossless compressed ones are generally 60-70MB (occasionally a bit bigger).