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The measure of the ability of paper to reflect the colors of light equally. The more evenly a paper reflects all colors of the spectrum, the better suited it is for presenting an accurate color representation of the printed images. Some papers may reflect cool colors back to our eyes and give the illusion that the sheet is actually brighter than white paper. If white paper has a slightly warm appearance it will not appear as bright as a sheet that reflects a cool color, however warm colors printed on a warm sheet will appear stronger than warm colors printed on a cool sheet. Cool colors printed on a cool white sheet are enhanced in the same way. The whiteness of digital papers is usually classified as true white, cream white, or blue white. Although true white varieties of paper reflect all colors of the spectrum equally, blue white varieties actually appear whiter to the human eye. True white paper varieties are often used for applications containing a high proportion of graphics and images. Blue white varieties are used for this purpose also, but the overall appearance of the printed document often appears cooler. Cream white papers, which provide a slightly yellow tone, are popular for digital book publishing.
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