CMYK color model

Additive and subtractive colors, printing.

6 flashcards · Computer Science · by lakesare

  1. What does CMYK stand for?

    Cyan Magenta Yellow Key (usually black!)

  2. Why is black ink used in CMYK instead of combining cyan, magenta, and yellow?

    Less expensive (than using the corresponding amounts of colored inks) To produce deeper black tones (although a combination of 100% cyan, magenta, and yellow inks should, in theory, completely absorb the entire visible spectrum of light and produce a perfect black, practical inks fall short of their ideal characteristics and the result is actually a dark muddy color that does not quite appear black.)

  3. Explain what's going on on this picture for yellow!

    This is how subtractive colors work! For yellow: We have white light shining on the paper. Printer throws some dye which ABSORBS BLUE. This results only in RED and GREEN reflected, which, mixed together, is yellow.

  4. What filter needs to be applied in order to produce red light?

    Light consists of R, G, and B. To only leave the R reflected, - we need to absorb G and B. To absorb Blue - use Yellow. To absorb Green - use Magenta. Producing light of one of the additive primaries can be done by applying two appropriate subtractive primary filters in succession.We can produce red light, for example, by:1. applying a magenta filter (transmitting red and blue, but removing green wavelengths from the white light),2. and then a yellow filter (transmitting red and green but remov…

  5. While the key ink can be used to darken tones. How to lighten the printed color?

    Via halftoning - technique that simulates continuous-tone imagery through the use of dots. Left: Halftone dots.Right: How the human eye would see this sort of arrangement from a sufficient distance. Dithering is analogous to the halftone technique used in printing. The recent widespread adoption of inkjet printers and their ability to print isolated dots has increased the use of dithering in printing. For this reason the term dithering is sometimes used interchangeably with the term halftoning,…

  6. This is an image in 1-bit black-and-white space. What technique was used here?

    Dithering. A common use of dither is converting a greyscale image to black and white, such that the density of black dots in the new image approximates the average grey level in the original. Like all terms they are misused, but to me the difference is that you wouldn't usually talk about halftoning if you were working with images for display on a computer. Whereas, if you were talking about printing then you would usually use halftoning to refer to amplitude modulation (little circles), and di…