This practice specifies a color bar pattern compatible with both high- and standard-definition environments. The multi-format color bar signal originates as an HDTV signal with an aspect ratio of 16:9 and may be down-converted to an SDTV color bar signal with an aspect ratio of either 4:3 or 16:9. The color bar signal is generated with unconventionally slow rise and fall time values, and is theref...