How many colors are there? A lot, as this atlas by Tauba Aurebach illustrates:
american artist tauba auerbach presents the 8 x 8 x 8-inch hard-back cubes illustrating the RGB color scheme in a page-by-page medium. a digital offset print on paper with airbrushed cloth cover and book edges create a colorful reference volume of all the colors in existence.
Link -via Nerdcore | Artist's Website
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Also this book is clearly not representing all the visible colors, let alone all the colors in existence. Subtractive color (like printing) has a smaller color gamut than additive color (like a computer monitor), although there is some overlap between the two.
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Gorgeous but RGB in CMYK color space? Sounds like a printer's nightmare.
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