Standard-dynamic-range video (SDR video) is a video technology that represents light intensity based on the brightness, contrast, and color characteristics and limitations of a cathode-ray-tube (CRT) display. SDR video can represent a video or picture’s colors with a maximum luminance around 100 cd/m2, a black level around 0.1 cd/m2, and Rec. 709 / sRGB color gamut. It uses the gamma curve as its electro-optical transfer function. The first CRT television sets were manufactured in 1934, and the first color CRT television sets were manufactured in 1954. The term *standard-dynamic-range video* was adopted to distinguish SDR video from high-dynamic-range video (HDR video), a new technology that was developed in the 2010s to overcome SDR’s limits.
The conventional brightness and color envelope that video has used since the tube-television era, standard dynamic range defines how dark, how bright, and how colorful an image is allowed to be. It remains the baseline every screen, browser, and platform can display without special handling. In practical terms, standard dynamic range means 8 bits of precision per color channel, the Rec. 709 color gamut, and a reference brightness of roughly 100 nits. Those limits date to the physics of cathode-ray tubes, yet they still describe the overwhelming majority of video published today.
SDR Compared to HDR
High dynamic range (HDR) expands every one of those limits, and the contrast between the two standards explains most of the confusion around modern video delivery.
- Bit depth: SDR uses 8-bit, while HDR uses 10-bit or higher
- Peak brightness: SDR has about 100 nits, while HDR has 1,000 nits and beyond
- Color gamut: SDR uses Rec. 709, while HDR uses Rec. 2020 or Display P3
- Compatibility: SDR is universal, while HDR is device and platform dependent
Why Most Web Video Stays SDR
Browsers, embedded players, and older devices handle standard-range footage identically, while their treatment of high dynamic range varies from gorgeous to washed out depending on the screen, the operating system, and the tone-mapping applied when a display cannot reproduce the extended values. Publishing in standard range removes that variability, keeps files smaller, and guarantees the audience sees roughly what the editor saw.
What SDR Means for Marketers
Brand color only exists if it renders consistently, and standard dynamic range is still the only envelope that guarantees consistency across every customer screen. Unless a campaign controls its playback environment end to end, delivering in standard range protects both the palette and the page weight; footage shot in HDR simply gets tone-mapped down during the encode.
