Analog TVs used 486 lines per frame, 60Hz for convenience. Digital TVs switched to 30fps at 480 lines resolution. European TVs used 50Hz, providing 576i resolution. Ceefax technology used spare lines for one-way internet
Human eye sees wavelengths from 400 to 700 nanometers. Visible light is divided into ROYGBIV colors: red, orange, yellow, green, blue, indigo, violet. Violet has shortest wavelength, red has longest wavelength. Newton divided spectrum into seven colors in 1671
Shape represents an object's form or external boundary, distinct from color and texture. A figure includes both shape and size, while a plane shape lies on a plane. Geometric shape excludes position, size, orientation and chirality information
Michael Jackson was 5'9" (175.3 cm) tall according to various sources. He claimed to have grown significantly from 5'10" during adolescence. His sister La Toya confirmed his rapid height increase in 1992
Color is visual perception based on electromagnetic spectrum. Humans perceive colors with three types of cone cells (trichromacy). Colors have properties like hue, saturation, and luminance. Colors can be mixed additively or subtractively
Different parts of the eye perform differently, with the center being better at motion. The brain processes visual information at a certain speed. The whole visual system is more accurate than individual neurons