Test media for display calibration checks, pipeline verification and audio/video synchronisation.

Still patterns (16-bit PNG, 1920 × 1080 and 3840 × 2160)

• Grey Ramp: banding and bit-depth truncation
• 21-Step Grey Scale: gamma and tracking
• Colour Bars 100% / 75%: level and saturation reference
• Black and White Level Steps: crush (0–4.5%) and clip (95.5–100%)
• Zone Plate: scaling, sharpening and aliasing
• Hue and Saturation Sweep: gamut and hue linearity
• 24-Patch Reference Chart: colour reference, with skin-tone swatches

Video (1080p24, H.264 + 24-bit PCM)

• Countdown Leader: 10 s, with a single-frame 1 kHz 2-pop
• A/V Sync Test: 30 s, a one-frame white flash with a coincident 1 kHz pip once per second, for measuring display and audio latency

Free for any use.