A studio portrait of a girl, made in Queensland in the 1890s. You choose how hard to squeeze it for a stranger. Nothing leaves this page: the compression runs in your browser.
The portraitAfter your savesWhat was lost, as dots
The hash of the original. It proves which photograph it was.
The hash of your copy. It proves nothing about what you can still see.
FIG. 7. Lossy. Portrait: "Studio portrait of a young girl, 1890s", State Library of Queensland, public domain, through Wikimedia Commons. JPEG generation loss is measured here in the page: edge energy kept in the 20 percent of blocks with the most detail against the flattest half. The hash is SHA-256 of the original pixels. Credits.