Fronalpstock big.jpg — Hannes Röst
Source: https://commons.wikimedia.org/wiki/File:Fronalpstock_big.jpg
Source derivative: https://thumb.wikimedia.org/wikipedia/commons/thumb/3/3f/Fronalpstock_big.jpg/3840px-Fronalpstock_big.jpg
License chosen: Creative Commons Attribution-ShareAlike 3.0 Unported
https://creativecommons.org/licenses/by-sa/3.0/

alpine-panorama-source.jpg is the 3840px Wikimedia thumbnail of this photographic panorama (stitched from 12 photographs).
Filedeck's example output is resized and re-encoded in the browser. Both files remain under CC BY-SA 3.0. No endorsement by the photographer is implied.
When reusing either image, retain attribution, identify changes and distribute adaptations under the same or a compatible license.

interface-screenshot-source.png is a screenshot of Filedeck's own local homepage, captured during development, then saved as PNG for a repeatable conversion example. It contains no user files, account data or third-party photographs. The initial browser capture was JPEG; it is not represented as a native lossless screen capture.