VLC's promise - toss any format and it renders - for stills, in pure C#. The one scene at top-left is encoded through every 1.6 raster codec (PNG · BMP · JPEG · TGA · PPM · GIF), then each blob is re-opened through a single content-sniffing front door (OpenAnyImage), normalized, and re-encoded with the 1.6 Png codec - no file, no browser, no System.Drawing. MAE is the mean absolute RGB error of the round-trip: 0 = bit-exact; JPEG/GIF report their real, bounded loss.
opener: ImageSniffer = the library's own universal decoder (WIRED) · fallback:* = the proposed 1.7 sniffer-completion shim, demonstrated working · sniffer Unknown = the verified gap: Tga.Decode/Ppm.Decode exist but ImageSniffer never routes to them.
imaging self-test: 35 KATs passed ✓ · every tile below was decoded from real codec bytes