Subtractive mixing

Subtractive hybridization, 73 354 Subtractive image dyes, 79 262 Subtractive instant color films, 79 296 Subtractive mixing, in color photography, 79 241-245... 

Subtracting mixed numbers with the same bottom number is similar to adding mixed numbers. 

Converting Improper Fractions to Mixed Numbers Converting Mixed Numbers to Improper Fractions Adding Mixed Numbers Subtracting Mixed Numbers Multiplying Mixed Numbers Reciprocals of Mixed Numbers + Dividing Mixed Numbers... 

We can use a similar strategy to subtract mixed numbers. In a subtraction problem involving two mixed numbers, subtract the whole number part of the second mixed number from the whole number part of the first mixed number. Then, subtract the fraction part of the second mixed number from the fraction part of the first mixed number. 

Just as you need common denominators to add mixed numbers, you need common denominators to subtract mixed numbers. 

Subtracting mixed numbers can get a little tricky when the fraction part of the mixed number that is being subtracted is greater them the fraction part of the mixed number from which it is being subtracted. When that happens, we must borrow from the whole number part of our answer. 

Sometimes there is an extra borrowing step when you subtract mixed numbers with the same bottom numbers, say 7y - 2y ... 

A mixed measure is part one unit and part another unit. For example, 12 feet 5 inches is part feet and part inches. When adding or subtracting mixed measures, you just need to align the units and perform the operation at hand. You can then rename units as necessary. 

Strictly speaking, subtractive mixing occurs only with dyes, which absorb light, but cannot reflect it. Pigment particles reflect some light from their surfaces. 

Hand-drawn designs perhaps colored with subtractive mixes of the red yellow blue (RYB) paint primaries. Glare from substrate and its color may affect color reproduction when scanned or photographed. 

Color cannot be measured because it is perceived in the brain. However, it can be specified instrumen-tally using additive or subtractive mixing to produce a color that matches the object color. In the former, a match to most colors can be made by the additive mixing of light of the three primary colors. A measure of the intensity of the three primaries provides a specification of the color. Primary colors are defined such that none can be matched by mixtures of the other two. The principle of additive mixing is the basis of the common tristimulus and spectrophoto-metric methods of measurement. 

From experience and by application of the principles of subtractive mixing, the pigments likely to give the colour are chosen. The procedure is described under Pigment selection (above). 

A primary color is one of a set of colors that when added together as light produce white light. Subtractive mixing leads to an absence of color (black). Red, yellow, and blue are a set of primary colors. 

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