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Design Glossary Q-T

US Printing | Design & File Preparation Glossary Q-T |

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Raster Images

Raster Images, commonly referred to as bitmap images, are digital images stored as arrays of pixels for display and modification. The graphic's resolution is limited by the capabilities of the display device. Adobe Photoshop is a popular image editor that rasterizes images that it opens.

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Resolution is the number of pixels displayed per unit of length in an image, usually measured in pixels per inch (ppi) or dots per inch (dpi). Computer monitors are normally 72 to 96 dpi while most printed pieces are 300 dpi or more.

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RGB refers to the additive primary colors - red, green and blue - that are used in computer monitors to create all colors. RGB is similar to CMYK used in process printing in that all colors are created by various combinations of a few base colors. However, the colors seen on an RGB screen will only accurately represent the colors printed in CMYK when calibrated computer systems and translators are used.

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Rich Black

Rich black is made by mixing other colors of ink with black ink to produce a much darker, deeper black on press than can be achieved by using black ink alone. To create rich black on pieces printed by US Printing, your CMYK calibration values must be 50% Cyan, 40% Magenta, 40% Yellow, and 100% Black.

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Tagged Image File Format (.TIFF)

Tagged image file format or .TIFF for short is one of the most widely supported file formats for storing images on a computer. TIFF can handle up to 24 bits of photographic image, but TIFF is an older format that requires more storage space than needed for files in .JPEG or .PSD formats.

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TIFF is abbreviation for tagged image file format.

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