Red is created by mixing magenta and yellow (removing green and blue). Subtractive mixing is used to create a variety of colors when printing or painting on paper or other white substrates, by combining a small number of ink or paint colors. The secondary colors are the same as the primary colors from additive mixing and vice versa. In subtractive mixing of color, the absence of color is white and the presence of all three primary colors makes a neutral dark gray or black. The three primary colors typically used in subtractive color mixing systems are cyan, magenta, and yellow, corresponding to the CMY color model and CMYK color model widely used in color printing. This results in a darker and desaturated color compared to the color that would be achieved with ideal filters. Note however that this description is theoretical and that the mixing of pigments does not correspond to ideal subtractive color mixing because some light from the subtracted color is still being reflected by one component of the original paint. The resulting paint reflects only red light and so appears red to our eyes. The red paint can be said to subtract the green from the yellow paint.
However, the red paint will absorb the green reflected by the yellow paint. The yellow paint absorbs all colors except for red and green. When we mix the two paints, the resulting substance has red paint and yellow paint. Making recourse to the figure above demonstrating additive color mixing, one sees that yellow light is composed of an (additive) mixture of red and green light. This same mechanism describes the color of material objects – note that light is not a material object – and so applies to the yellow paint as well. The red light, not being absorbed, is reflected by the paint and seen by our eyes. Red paint is red because, when the ambient light strikes it, the composition of the material is such that it absorbs all other colors in the visible spectrum except for red.
To explain the mechanism, consider paint. The mixing of colored physical substances corresponds to subtractive color mixing, hence it corresponds to our intuition about mixing colors. For real pigments, the results would be somewhat complicated by opacity and mixing behavior, and in practice adding a fourth pigment such as black may be helpful. Combining all three primaries (center) absorbs all the light, resulting in black. The standard subtractive primaries cyan, magenta, and yellow combine pairwise to make subtractive secondaries red, green, and blue (which are additive primaries, or in practice somewhat darker and less-saturated versions of typical additive primaries).
An external source of illumination is assumed, and each primary attenuates (absorbs) some of that light. Projection televisions sometimes have three projectors, one for each primary color.Ī simulated example of (idealized) subtractive color mixing. A screen pixel uses a juxtaposition of these three primary colors. Red-green–blue additive mixing is used in television and computer monitors, including smartphone displays, to produce a wide range of colors. When the blue and red lights mix, the result is magenta. When green and blue lights mix, the result is cyan. When the red and green lights mix, the result is yellow. If all three primary colors of light are mixed in equal proportions, the result is neutral (gray or white). In the absence of light of any color, the result is black. Two beams of light that are superimposed mix their colors additively.īy convention, the three primary colors in additive mixing are red, green, and blue. The additive mixing of colors is not commonly taught to children, as it does not correspond to the mixing of physical substances (such as paint) which would correspond to subtractive mixing. Combining all three primaries (center) produces white. The primaries red, green, and blue combine pairwise to produce the additive secondaries cyan, magenta, and yellow. Additive primaries act as sources of light. A simulated example of additive color mixing.
0 kommentar(er)
