This means that the colours you get depend on the colours existing in the light from which you remove colours, and also their relative intensities. The light from the sun is a mix of colours, and then you add paint to remove some of the colours from the light so to speak. the sun) that shine on your painting or whatever. In subtractive mixing, you have some light source (e.g. the lamps you use shine with the colours that they shine, period. Note that additive mixing is in a sense independent, i.e. a LED or LCD) or subtractive mixing (you remove light by adding e.g. colours that humans cannot see at all.Īs others already have explained, creating colours from primaries also function differently depending on whether you use additive mixing (you produce light using some sort of lamp, e.g. Animals may have different, or even more, photoreceptors, which for example allows certain birds to see ultra-violet, i.e. But again, there are no "true" primary colours. Depending on the responses of the three receptors, our brain constructs an image in our minds. It responds most strongly to yellow, but it also responds "sees" red and green, and even blue although very weakly. Each receptor responds differently to different wavelengths, see this picture from wikipedia: Contrary to popular belief, each receptor can actually "see" more than one colour. Regarding human vision, we have three colour photoreceptors. Of these gamuts, Adobe RGB is wider than sRGB, i.e. Here, they look at at how well the monitor covers at least 4 different colour gamuts, all of which are a type of RGB-gamut (since the panel has red, green and blue pixels): SDR gamuts "sRGB" and "Adobe RGB", and HDR gamuts "DCI P3" and "Rec. Take a look at this review of an LCD-panel over at Rtings. RGB is often used in screens becasue it covers a large amount of the visible colours and we have the technology to create red, green and blue pixels using e.g. So no, there are no 3 (or any finite number of) colours that can create all other colours.Īny colour gamut is fundamentally arbitrary, but we of course try to create gamuts that cover as much of all visible colours as possible using the technology we have. One important fact to note is that it is practically and theoretically impossible to create all colours from a finite set of primary colours. You can technically even have only two or one primary colour for a gamut, although that would be pretty useless (in the case of only one primary colour, the gamut would consist of only that colour). This means that basically any set of colours can function as primary colours for the gamut that these colours may create. Primary colours is basically just a set of colours that produce some gamut of colours by mixing the primary colours. The most common ones are the paint (subtractive), light (additive) and ink (subtractive) models. So in the end what colors are considered primary depends on the so called "color model". It simply depends on the way these colors are mixed and if all other colors can be obtained. Thus there are no "real" or "unreal" primary colors. The definition literally states "any of a group of colours from which all other colours can be obtained by mixing". So to say "those are the primary colors" without mentioning the way of mixing is simply wrong. So this way of mixing is - additive - and here the primary colors are Red, Green and Blue. Thus wenn mixing them together you receive blue and red data. So a red light emits "only in the red" and a blue light "only in the blue". However everything that - emits - light mixes by - adding - colors to the pool. So when mixing paint together more colors are absorbed, thus more colors are subtracted, from the color pool.ĭue to this behaviour the primary colors of subtractive color mixing of paint in art and design are Red, Yellow and Blue. In paint the way of mixing is subtractive as each pigment of paint - absorbs - "all but one color" so a red pigment absorbs all light quite good except for red light which is reflected back to you, thus you see the paint as red. The way of mixing defines what colors are primary colors. Primary colors are simply any set of colors that can reproduce all other colors by mixing them.
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