standard

Annex K

The informative annex of the JPEG standard that supplies sample luminance and chrominance quantization tables, which most encoders scale by a quality factor.

Known aliases

Annex K reference table
JPEG Annex K

Relationships

No evidence-backed relationships are recorded.

Current clusters

build1 publisher

Fitting Annex K to WhatsApp's returned JPEGs leaves a 37% mean residual

A month of measured round trips on one handset found WhatsApp, Instagram and Facebook encoding on quantization tables the JPEG standard never described, while Telegram sent back a plain scaled Annex K near quality 87.

Publishers:dev.to

Reality

Evidence62
Adoption: Insufficient
Hype gap+12
Incentives30
Confidence55