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Additive  Primaries
Color Temperature - 14209_310

Photography (Basic) - Introduction to photography and other graphic techniques
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Figure 12-2.–Color star. C303.74 This whole concept of color by subtraction may seem confusing at first, but if you accept this concept, it will  suddenly  become  very  clear.  Color  printing  is  built around  color  by  subtraction. COLOR  STAR To help understand color theory, draw a color star and use it through the color process (fig. 12-2). With a color star, both additive and subtractive color effects can be  illustrated. The color star shows how colors can be mixed. Any two primaries (colors) on opposing points of a given triangle, when mixed, will produce the color between them; for example, green and red = yellow; yellow and cyan = green; and green and blue = cyan. Just as important, the color star shows the colors that will neutralize each other. These colors are called complementary  colors  and  are  located  across  from  each other; that is yellow  is  complementary  to  blue; Corrective filters magenta  is  complementary  to  green;  and cyan is complementary to red. Thus yellow neutralizes blue, blue neutralizes yellow, red neutralizes cyan, cyan neutralizes red, and so forth. When colors are neutralized, the results are grays or blacks. That is called neutral density. The neutral density may be either full or partial, depending on the relative strengths and amounts of the neutralizing colors; for example, equal amounts of blue and yellow produce neutral density. A weak blue and a strong yellow yields a grayish yellow. The information on the color star can be applied directly to color printing and color filtration. The filters used  in  color  printing  subtract  colors  from  the  light source of the enlarger before it reaches the color printing paper; for example, to subtract green from the light, you use a magenta filter, or to subtract blue, you use a yellow filter or vice versa. In  color  printing,  filters  are  always  used  to  subtract a particular color. You can determine which filter subtracts a given color from the light source of the enlarger by finding its opposite or complementary color on the color star. For example, you want to subtract green from the light. First, find green on the color star. Next, locate the complementary color of green by looking  across  from  it.  You  have  located  the  color, magenta; therefore, to remove green from the light source, you must addmagenta filtration in the enlarger. The basic overview of the principles of color photography applies directly to color printing. If you need additional review of light and color principles, refer to chapter 1 of this training manual. The remainder of  this  chapter  should  help  you  get  a  better understanding  of  color  printing  and  provide  the information you need to make good, professional quality  color  prints. COLOR ENLARGERS AND PRINTERS Other than the basic exposure factors of intensity and time, there are other factors to consider in printing equipment. Some of these considerations are as follows: Quality of the lens Color temperature of the light source used for printing Accuracy of the enlarger timer Stability  of  the  power  (voltage)  supply 12-3







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