How cmy model is used in printing?
The CMY color model is a subtractive color model that predicts the appearance of cyan, magenta and yellow. The name of the model comes from the initials of the three subtractive primary colors Cyan, Magenta, and Yellow. A printed color that looks red absorbs the other two components G and B and reflects R. Thus its (internal) color is G+B=CYAN. Similarly R+B=MAGENTA and R+G=YELLOW. Thus the C-M-Y coordinates are just the complements of the R-G-B coordinates.
If we want to print a red looking color (i.e. with R-G-B coordinates (1,0,0)) we have to use C-M-Y values of (0,1,1). Note that M absorbs G, similarly Y absorbs B and hence M+Y absorbs all but R.
Black (R,G,B)=(0,0,0) corresponds to (C,M,Y)=(1,1,1) which should in principle absorb R, G and B. But in practice this will appear as some dark gray. So in order to be able to produce better contrast printers often use black as 4th color. This is the CMYK model. K stands for Key(Black). Its coordinates are obtained from that of the CMY model by K:=max(C,M,Y). According to the theory, 100% cyan, 100% magenta and 100% yellow would result in a pure black. With today's printing colors it is not possible to realize this, so in the area of printing the additional component key (K, black) is necessary.
Thank you so much Ibrahim.
Really helpfu.
Yes. It is the process.