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YPbPr

Analog video component signals

Also written Y'PbPr or YPBPR.

  • Y' = luma and sync (brightness/luminance and syncrhonization)

  • Pb = difference between blue and luma (B - Y)

  • Pr = difference between red and luma (R - Y)

  • Kb = constant defined from target color space, such that Kb + Kr + Kg = 1

  • Kr = constant defined from target color space, such that Kb + Kr + Kg = 1

Kb and Kr constants are not yet included in this package.

New Color​

Color.from('ypbpr', [y, pb, pr], {
  kb: number, // REQUIRED
  kr: number, // REQUIRED
})

Conversion to​

.to('ypbpr', {
  kb: number, // REQUIRED
  kr: number, // REQUIRED
})

YCbCr conversion​

.to('ycbcr', {
  yLower: number, // optional, default = 16,  lower bounds of Y'
  yUpper: number, // optional, default = 235, upper bounds of Y'
  cLower: number, // optional, default = 16,  lower bounds of Cb and Cr
  cUpper: number, // optional, default = 240, upper bounds of Cb and Cr
})

Get methods​

.getY(): number
.getPb(): number
.getPr(): number
.getKb(): number
.getKr(): number

JavaScript​

const Color = require('chromaticity-color-utilities')

const color1 = Color.from(
  'ypbpr',
  [0.2848, 0.3854278939426601, 0.45415290830581667]
)
const color3 = color2.to('ypbpr', {
  kb: 0.0722, // Rec709
  kr: 0.2126, // Rec709
})
const color4 = color1.to('ycbcr')
const color5 = color1.to('ycbcr', {
  yLower: 0,
  yUpper: 255,
  cLower: 0,
  cUpper: 255,
})

TypeScript​

import Color from 'chromaticity-color-utilities'

const c: Color.ypbpr = Color.from(
  'ypbpr',
  [0.2848, 0.3854278939426601, 0.45415290830581667]
)