Color Gamuts and Spot Colors


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Color Gamuts and Spot Colors

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Color Gamuts and Spot Colors

  1. 1. C o l o r gamut ashish as it [email_address]
  2. 2. C o l o r gamuts <ul><li>The gamut, or color space, of a color system is the range of colors that can be displayed or printed. The spectrum of colors that can be viewed by the human eye is wider than any method of reproducing color. </li></ul>
  3. 3. <ul><li>The RGB gamut contains the subset of colors that can be viewed on a computer or television monitor (which emits red, green, and blue light). </li></ul><ul><li>Some colors, such as pure cyan or pure yellow, can't be displayed accurately on a monitor. </li></ul><ul><li>The smallest gamut is that of the CMYK model, which consists of colors that can be printed using process-color inks. </li></ul><ul><li>When colors that cannot be printed are displayed on the screen, they are referred to as out-of-gamut colors (that is, they are outside the CMYK gamut). </li></ul>Color Gamut
  4. 4. RGB and CMYK color gamuts compared A. Visual gamut B. RGB color gamut C. CMYK color gamut
  5. 5. Spot Colors <ul><li>A spot color is a special premixed ink that is used instead of, or in addition to, CMYK process inks, and that requires its own printing plate on a printing press. </li></ul><ul><li>Use spot color when few colors are specified and color accuracy is critical. </li></ul><ul><li>Spot color inks can accurately reproduce colors that are outside the gamut of process colors. However, the exact appearance of the printed spot color is determined by the combination of the ink as mixed by the commercial printer and the paper it's printed on, not by color values you specify or by color management. </li></ul><ul><li>When you specify spot color values, you're describing the simulated appearance of the color for your monitor and composite printer only (subject to the gamut limitations of those devices). </li></ul>
  6. 6. … .Spot Colors <ul><li>Minimize the number of spot colors you use. Each spot color you create will generate an additional spot color printing plate for a printing press, increasing your printing costs. If you think you might require more than four colors, consider printing your document using process colors. </li></ul>
  7. 7. Process Color <ul><li>A process color is printed using a combination of the four standard process inks: cyan, magenta, yellow, and black (CMYK). Use process colors when a job requires so many colors that using individual spot inks would be expensive or impractical, such as when printing color photographs. </li></ul>
  8. 8. Guidelines to specify a process color: <ul><li>For best results in a printed document, specify process colors using CMYK values printed in process-color reference charts, such as those available from a commercial printer. </li></ul><ul><li>The final color values of a process color are its values in CMYK, so if you specify a process color using RGB, those color values will be converted to CMYK when you print color separations. These conversions will work differently if you turn on color management; they'll be affected by the profiles you've specified. For more information on setting up color management in Illustrator, </li></ul>
  9. 9. … .process color <ul><li>Don't specify a process color based on how it looks on your monitor unless you have set up a color management system properly and you understand its limitations for previewing color. </li></ul><ul><li>Avoid using process colors in documents intended for online viewing only, because CMYK has a smaller color gamut than a typical monitor. </li></ul>