Color Models Part III

Duration: 1 min

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The video presents a lecture on the CMY color model, a subtractive color model used for hard-copy devices like plotters. The instructor explains that CMY uses cyan, magenta, and yellow as primary colors. A diagram of a 3D cube illustrates the model, where the origin (0,0,0) represents white light and the point (1,1,1) represents black, as all light components are subtracted. The lecture details how cyan ink absorbs red light, magenta absorbs green, and yellow absorbs blue. It also explains that combining cyan and magenta inks produces blue light because the red and green components are absorbed. The video concludes by introducing the mathematical conversion from an RGB representation to a CMY representation using a matrix transformation, showing the formula C = 1 - R, M = 1 - G, Y = 1 - B.

Chapters

  1. 0:00 – 1:13 00:00-01:13

    The video begins with a slide titled 'CMY COLOR MODEL'. The instructor explains that CMY is a subtractive color model defined by the primary colors cyan, magenta, and yellow, used for hard-copy devices. A 3D cube diagram is shown, with axes labeled C, M, Y, representing the three primary colors. The origin (0,0,0) is white, and the opposite corner (1,1,1) is black, indicating that all light components are subtracted. The instructor explains that cyan is formed by adding green and blue light, so a cyan ink absorbs the red component. Similarly, magenta ink absorbs the green component. The slide also states that a combination of cyan and magenta ink produces blue light because the red and green components are absorbed. The final point on the slide introduces the conversion from an RGB representation to a CMY representation using a matrix transformation, with the formula C = 1 - R, M = 1 - G, Y = 1 - B.

The lecture systematically introduces the CMY color model, starting with its definition and application, then using a 3D cube diagram to illustrate the relationship between the primary colors and the resulting colors, including black and white. It explains the subtractive nature of the model by detailing how each ink absorbs a specific primary color component. The lesson culminates in the mathematical conversion from the additive RGB model to the subtractive CMY model, providing a practical formula for this transformation.