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Extra info for Apple - Aperture Digital Photography Fundamentals
An 8-bit color channel can represent 256 possible values (28), while three 8-bit color channels can represent 16,777,216 values (224). RAW image files also use three color channels. Because most RAW files have the capacity to capture 12 to 14 bits per color channel, their range of colors is exponentially larger. Chapter 3 Understanding Resolution 39 The following example illustrates how increasing the bit depth of a pixel increases the number of color values it can represent. Increasing the bit depth by 1 bit doubles the number of possible color values.
Obviously, the more pixels the image file has, the more information it’s capable of displaying. However, along with the number of pixels, the bit depth plays a large part as well. The greater the bit depth, the more colors a pixel is capable of displaying. For more information on bit depth, see “Learning About Bit Depth” on page 38. Â Printer resolution: A printer’s resolution is determined by how closely together it is capable of placing dots on paper within a square inch, measured in dpi. A printer’s maximum dpi value determines the highest-quality image it can print.
The second method involves vibrating a tiny valve filled with ink, forcing it to fling a droplet onto the page. Â Dye sublimation: Dye sublimation printers create images by heating colored ribbon to a gaseous state, bonding the ink to the paper. The ribbon is a plastic material that makes the print nearly waterproof and difficult to tear. The incredible durability of dye sublimation prints gives them a longevity that cannot be surpassed by any other medium. The quality of inkjet printers has improved remarkably in the past few years, making their resolution and color gamut superior to those of dye sublimation printers.