RGB Color Space: Color are represented as combinations ofthree primaries: red, green, blue)- C=rR+gG+ bB- The reason why we pick red, green, and blue?· essentially because of the structureof our visual system: Our visual system is sensitive to those threecolors: A demo for Color
RGB Color Space • Color are represented as combinations of three primaries: red, green, blue) – C = rR + gG + bB – The reason why we pick red, green, and blue? • essentially because of the structure of our visual system • Our visual system is sensitive to those three colors • A demo for Color
RGB Color Space: Color are represented as combinations ofthree primaries: red, green, blue)- C=rR+gG+ bB- The reason why we pick red, green, and blue?BlueGreenRed
RGB Color Space • Color are represented as combinations of three primaries: red, green, blue) – C = rR + gG + bB – The reason why we pick red, green, and blue?
RGB Color SpaceUnfortunately ,Some0.4T(2)b(a)colors cannot be可(a)0.2written ascombinations of RGBtriples, because some-0.2400700parts of the red curveWavelength (nm)is negative
RGB Color Space • Unfortunately ,Some colors cannot be written as combinations of RGB triples, because some parts of the red curve is negative
Other Color SpacesSo some other color space are also used-CMY-HSV-CIEXYZ
Other Color Spaces • So some other color space are also used – CMY – HSV – CIE XYZ
CMY? CMY :The other set of primaries besides RGBCyan(青),magenta（品红），and yellow-complements（补色）of red,green, blueRCMGAB·It's called subtractiveprimaries（减色系统）- RGB are additive primaries start with black, add upto white- CMY start with white and subtract colors from white
CMY • CMY :The other set of primaries besides RGB – Cyan(青), magenta（品红）, and yellow — complements （补色）of red, green, blue • It’s called subtractive primaries（减色系统） – RGB are additive primaries — start with black, add up to white – CMY — start with white and subtract colors from white