dimensioni file immagine HDR (.dng) molto più piccole di originale

[orsolai16769571]

When I use the HDR Merge feature, Lightroom saves everything into a new HDR image file (.dng). But looking at the properties, I noticed that this file is much smaller than the original raw file. I would like to know if it loses quality, in case I later want to print large formats, and if there are any settings to change, to obtain better quality files

[JohanElzenga]

Yes, it is smaller because it uses JPEG XL compression. This is very sophisticated compression, that does not cause visible loss at all.

[orsolai16769571]

Thank you very much!!

[John R Ellis]

LR 13.0 started using JPEG XL compression rather than JPEG, which it used before. JPEG XL produces the same quality but with much larger space savings:

https://www.lightroomqueen.com/whats-new-in-lightroom-2023-10/

There is no way to change this, but there's no need to, since there is no visually perceptible differences.

[orsolai16769571]

Thank you very much!!