Apple - Aperture Digital Photography Fundamentals

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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.

This is why professional photographers bracket their images, whenever possible, to be absolutely sure they have a correctly exposed image. Bracketing involves taking three shots of the same image based on the aperture and shutter values recommended by the light meter: one shot underexposed one stop, one shot at the recommended exposure, and one shot overexposed one stop. Shooting the image with a range of three exposure stops is the best way to ensure you’ll have a properly exposed image. Note: Most DSLR models have a built-in, automatic exposure-bracketing feature.

The reason for this is that digital devices like LCD displays combine red, green, and blue light in different combinations to produce the desired color. All colors combined at their maximum intensities create white, and the absence of color creates black. On the other hand, a printed piece like a magazine cover combines cyan (C), magenta (M), and yellow (Y) inks in different combinations to create a color that reflects the proper color of light. Black ink (K) is added to the image last to generate pure black on the page.

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