Bright white, #FEFEFE, is one point under pure. It looks identical to #FFFFFF to the eye, and I use it for one specific reason.
Where I use bright white
- Showing clipping. In an editor’s highlight warning, 254 does not flash and 255 does. A 254 ground tells me the background is not blown.
- Web images on white pages. Indistinguishable from the page.
- Print. Keeps a trace of dot in the highlight on some presses.
- Screen backdrop. As bright as white in practice.
Where I do not
A strict pure-white check wants 255. For Amazon main images use #FFFFFF.
One point matters
Automated checks compare numbers, not appearance. Know which white you exported.