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Mixing colored light adds wavelengths together, while mixing paint combines pigments that absorb parts of the light shining on them. That is why red and green light can appear yellow, but mixing red and green paint usually produces a darker, less vivid color. The difference starts with how light reaches your eye.
How light becomes color
Color is a visual experience produced by light reaching the eye. When light hits an object, its surface reflects some wavelengths and absorbs others. The reflected light reaches your eye, and your brain interprets it as color. An object’s appearance therefore depends both on its surface and on the light illuminating it; the same paint can look different under different lighting. Sherwin-Williams explains reflected light and color, while a NCBI Bookshelf chapter on color vision describes selective absorption and transmission.
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Why mixing colored light is additive
In additive mixing, light sources combine their light at the eye. The familiar RGB model uses red, green, and blue light: red and green light together can be perceived as yellow. In this model, adding light tends toward brighter results, and combining the RGB primaries is associated with white. Screens and projected light are everyday examples.
RGB is a model for combining emitted light, not a recipe for mixing pigments. The result depends on the light being emitted and how it reaches the viewer; the familiar red-plus-green example describes the standard model, not every possible pair of real-world light sources. Sherwin-Williams’ color-mixing explanation covers the RGB example.
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Why paint and printing use subtractive mixing
Paint, dyes, and printing inks do not add their own light in the way a screen does. Their pigments absorb portions of the incoming light. What remains is reflected from the paint or paper—or transmitted through a material such as a filter—and reaches the eye. Combining pigments changes which portions are absorbed, so more mixing generally means less reflected light and often a darker, less vivid result.
Printing is commonly described with cyan, magenta, and yellow (CMY), which selectively absorb portions of the white light reflected by paper. Printers add black as a separate component, making the process CMYK. The Pantone color-spaces explainer contrasts this subtractive printing approach with RGB light.
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Red, yellow, and blue are often taught as paint primaries, but that traditional convention is a simplified teaching model, not a universal rule for every pigment. RGB describes additive light; CMY is the printing-oriented subtractive model. Actual paint mixtures depend on the pigments involved and the illumination.
Light and pigment mixing at a glance
| Question | Additive light mixing | Subtractive pigment or ink mixing |
|---|---|---|
| What is combined? | Light sources or light reaching the eye | Pigments, dyes, or inks interacting with incident light |
| What happens? | Component light spectra combine | Materials absorb portions of the incoming light; the rest is reflected or transmitted |
| Common primaries | Red, green, blue (RGB) | Cyan, magenta, yellow (CMY); printing commonly adds black (CMYK) |
| Examples | Screens and projected light | Paint, filters, and printing |
| General direction | Adding light tends toward brighter results | More absorption generally leaves less reflected light |
Try a simple light-and-paint comparison
Use the comparison to notice what is being combined—not to expect every material to make an identical result.
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- For light: Overlap red and green colored light from suitable sources, or observe an RGB screen demonstration. In the standard additive model, the overlap can appear yellow.
- For paint: Put a small amount of two acrylic paints on a palette and mix them gradually. Observe how the result differs from the light example; the exact hue and brightness depend on the pigments.
- Compare: Light combines at the eye, while pigments change which parts of the illuminating light are absorbed and reflected. View the paint under more than one light source, if available, to see how illumination affects its appearance.
Why color diagrams are only models
RGB and CMY are useful ways to explain and manage color, but real light sources and pigments have spectra: they emit, absorb, reflect, or transmit light across ranges of wavelengths. Human vision responds to the light that reaches the eye, and a color-space representation cannot preserve every spectral detail involved in mixing. That is why a diagram or primary-color rule is a guide to a model rather than a guarantee for every real paint, ink, light, or viewing condition. Stanford’s color-mixing teaching resource illustrates how simplified color-space representations relate to spectra, reflectance, and transmission.
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