By Paul Klint

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A color inkjet has as few as four inks (with black being the fourth), or as many as seven different inks to work with. Rather than employing the optical process of adding light to attain the desired color, printing employs what's called a subtractive process. This theory works in precisely the opposite direction of optics. The subtractive process presumes that the purest light an object can reflect is white, so an object's color can be simulated by applying colored pigment or dye to mask out, or subtract, just those hues that an object absorbs and does not reflect.

NOTE Most modern tablets, including Wacom models, have a special button on the pen that assumes the function of double-clicking the left mouse button. Press this button once, not twice, to double-click. The process of picking up and moving somethingsuch as a flower petal you've selectedis different with a pen tablet than it is with a standard mouse. You'll see how to do this in proper detail later in this book; in brief, after you've selected the portion you want to move, plunk the pen down right in the middle of it, move the pen in the same direction you want to move the selection, and then lift the pen when the selection is in place.

However, you can't "fix" a blurry photo (although you can improve it somewhat). • If you've taken a picture of a person standing in front of the sun, her face is probably in shadow and the background is probably too light. Using the Editor, you can lighten her face and darken the background. Part I: Organizing Items in the Catalog 37 38 Part I: Organizing Items in the Catalog TIP To a certain degree, you can remove the effects of a flash that was either too close or too far away. • You can remove unwanted elements from a photographsuch as an electric cord draped along the floor, a price tag or a logo on a shirt, or a hunk of lettuce stuck in your subject's teethby selectively copying elements from elsewhere in the photo and using those elements to mask the unwanted ones.

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