Full Color Digital Graphics Key Terms
The Facts on Full Color
Full color adds a new dimension to your graphics and involves some new considerations. Below are a few key terms you'll want to know, plus some examples of how variations in resolution affect the appearance of a graphic.
Full Color
The reproduction of any color image by applying certain ink colors in varying proportions. Originals can be either RGB or CMYK files.
More on color models...
Spot Color
The addition of one or more colors to a graphic by applying inks of those specific colors. Spot color cannot reproduce full color images. More on color...
DPI
An abbreviation for "dots per inch", a measure of the density of ink dots used to reproduce the image. The more dots in the image, the higher the image clarity and the better the ability to enlarge that image. More important than the DPI is the total number of dots in a file. For large-format printing, a good rule of thumb is to plan for 100 to 150 dpi at the final printed size. For example, if you wish to have an image printed 24" x 36", then your computer file should have a minimum of 2,400 dots (24" x 100 dpi) by 3,600 dots (36" x 100 dpi), for a total of 8,640,000 dots. At an average of 3 bytes of storage per dot, that's about a 24mb file. Anything less simply won't have the quality you expect. More on megapixels...
Viewing Distance
Determines the DPI required. If your graphic will be viewed at close range, you will need a higher DPI. If it will be seen from a distance, a lower DPI image may give you all the resolution you need, saving time and money. For large applications, like vehicles, you can often come down from the 100 to 150 dpi ideal without sacrificing quality.
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