Appendix 4

Luminance and Chrominance Compression

The number 444 refers to the luminance (light) and chrominance (color) compression (brightness and color) (see Figure A4.1).

images

FIGURE A4.1 Chroma-luminance bandwidth illustration, where a 4:4:4 has no subsampling (each pixel contains the full luminance and chrominance value). In a 4:2:2 subsampling, half the pixels contain full luminance and chrominance value, while the remaining half contain luminance. (http://lea.hamradio.si/~s51kq/V-BAS.HTM.)

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