CMY is about the light reflected from color pigments on physical objects. CMY color : The complements of RGB primaries are Cyan, Magenta, and Yellow, which are the CMY primary colors of pigments , of paint, ink, dye, etc, called the Subtractive system, which are viewed by reflected light seen reflected from the inks or pigments printed on paper for example.
Less intense thinner CMY ink towards zero trends brighter, toward white which is in fact the blank white paper when we can see it through sparse ink.
For example, the light assuming white sunlight hits printed Yellow ink, which absorbs the Blue complement, but reflects the other colors of the white light, and the red and green components are seen as Yellow with no Blue present.
CMYK : Printed or painted color ideally would need only the three CMY inks, but which is less precise than RGB because the pigments are not perfect in their light absorption and reflection properties.
The K is for the Key ink Wikipedia , which is Black. Black ink ideally hopefully absorbs all light, but there's always still a little reflection, the pigments are not perfect absorbers. So CMYK is a solution, and another is that chemical photo printing the one hour machines today must shine light onto the paper emulsion, so corrective filters can be added to the light to offset any known emulsion dye problems. But pigments of ink and paint don't work that same optical way. Printing is a rather different subject than RGB.
RYB color is something else red, yellow, blue : Early history of artists seeking to make colors by mixing primaries of pigments did assume RYB as primaries. The exact CMY primaries of reflected painting were not known until well into the 20th century. Before that, artists mixing pigments used a centuries older view about RYB primaries, but it was ultimately discovered that RYB is not quite correct. Artists found RYB couldn't make all painted colors without using additional paint colors like green , but they adapted to deal with it.
The imperfect pigments also caused issues for the artists too, but the situation was not clear back then. Today, the red-purple Magenta is the same as the color called Fuchsia both colors are RGB , 0, RYB has this historical basis, and is still widely used in art education, but which we've finally learned is not the exact technically correct physics of color.
You will still commonly find RYB color wheels possibly called Traditional , which was the early theory, but not actual precise reality, so instead specifically look for RGB color wheels which also apply to CMY work.
But CMY are the fundamental primaries for modern printing and painting and color photo prints. RGB, Additive Color of light. CMY, Subtractive Color of pigments. These actual true complements are on directly opposite sides of the RGB color wheel, and are inverse, or actual opposite colors so to speak, meaning because when a color and its complement are equally mixed together, the color cancels out, and the mixed result becomes a colorless grayscale tone between white and black.
Inverting color negatives: In routine photo printing, when projecting the color negative image onto print paper, the orange film mask is filtered out with optical filters under the lens, and then printed on the CMY print paper which inverts more light darkens the paper emulsion more, so to speak. The analog light is NOT limited to values of But computer processing is limited to This is the inversion operation as done in the computer inversion tool.
Inversion processes each of the three components of RGB this way. Color film negatives have the light orange mask base which becomes strong deep blue when simply inverted. And since computer RGB processing is limited to 8-bit values Inversion is Not done for positive film slides of course, so camera chips can copy them well. But a real film scanner in Color Negative Mode, as opposed to a camera chip can remove the orange mask by varying the exposure time duration of the three RGB channels.
A film scanner better processes color negatives by exposing the blue channel about 3. The analog light is not limited at , so this simulates an analog optical filter to remove the orange mask, which is a big advantage.
Otherwise, see Processing Scanned Color Negatives. Many of the tools that we will use have builtin Color pickers. Here is one possible web page. There are many more. Colors or RGB Colors in a computer program are represented by combining 3 "pigments". RGB Colors All colors on a computer are made up by combining the light from three colors red, blue, and green.
Each color channel is expressed from 0 least saturated to most saturated. This means that 16,, different colors can be represented in the RGB color space. This has led to a great deal of frustration when people print out documents from Microsoft Office, only to have them turn out to be the wrong color.
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