What resolution corresponds to SDTV?

Standard Definition Television (SDTV) is typically characterized by lower pixel resolutions compared to High Definition formats. The most common resolutions that define SDTV are 480i and 480p, with 480i representing interlaced scan and 480p representing progressive scan.

The resolution of 480i corresponds to a display with 720 horizontal pixels and 480 vertical lines in an interlaced format, where alternate lines are drawn to create the appearance of a full image. This was the standard for many television broadcasts and is referred to as standard definition.

While both 480i and 480p are classified as SDTV, the interlaced format (480i) is more traditionally recognized when referring specifically to Standard Definition in the context of broadcast television. On the other hand, the resolutions of 720p and 1080p are classified as High Definition (HD). Therefore, identifying 480i as the resolution that corresponds to SDTV aligns accurately with the understanding of standard definition formats.