General Information 11 1 Use of Color When you use photos, diagrams or other image elements in color, they are printed in ‘full color’, or CMYK (Cyan, Magenta, Yellow and Key=black). These are the 4 basic colors used for both digital and offset printing. RGB vs CMYK In programs like Word and Publisher, only PDF files can be generated that are in the RGB (red, green and blue) color space. A printer cannot print RGB colors and therefore converts the RGB information into a CMYK color space. Because the CMYK color space is much smaller than the RGB color space (see image below), colors can be converted to the closest color that can be printed. This can lead to color surprises: your file can appear brighter in RGB on your screen than in CMYK on paper. If you use professional software such as Adobe InDesign or Illustrator, try to work in CMYK color mode as much as possible. This gives a better visual representation of the final colors in your print. If your file is set up in RGB, we will automatically convert it to CMYK. Color differences Please note that colors may appear differently on your screen than on paper. This may be due to the brightness and contrast settings of your monitor. Different paper types can also affect how colors appear.
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