TAILIEUCHUNG - Photoshop CS2 All-in-One Desk Reference For Dummies- P10

Photoshop CS2 All-in-One Desk Reference For Dummies- P10:Barbara Obermeier is principal of Obermeier Design, a graphic design studio in Ventura, California. She’s the author of Photoshop Album For Dummies, coauthor of Adobe Master Class: Illustrator Illuminated, Photoshop 7 For Dummies, and Illustrator 10 For Dummies. She has contributed as coauthor, technical editor, or layout designer for numerous books. Barb also teaches computer graphics at Brooks Institute; the University of California, Santa Barbara; and Ventura College | 248 Getting the Keys to Behave clicked at each corner of the inside of the frame with the Polygon Lasso tool resulting in the selection shown in the right example of Figure 3-2. Figure 3-2 Press the Alt Option on the Mac to delete from your existing selection. Intersecting two selections What happens when you press the Shift and Alt Option on the Mac keys together Not a collision but an intersection. Pressing both keys while dragging with the Lasso or Marquee tool or clicking with the Magic Wand tool creates the intersection of the original selection with the second selection. To retain only the part of an image where two selections overlap press Shift and Alt or Shift and Option on the Mac and then drag. You can select a portion of an image with a tool such as the Polygon Lasso tool. Then press the Shift and Alt Option on the Mac keys at the same time and drag with the Rectangular Marquee tool. The resulting intersection of the two selections appears. Getting the Keys to Behave Photoshop has a little glitch in its way of doing things. Well not so much of a glitch as a conflict. With so many ways of doing things with Photoshop somewhere along the line you may have to jigger with Photoshop to get it to do what you want. For example how does Photoshop know whether you want to create a perfect square or add to a selection when you press the Shift key Getting the Keys to Behave 249 Let me lay this out for you When you make an initial selection with the Rectangular or Elliptical Marquee tool pressing the Shift key constrains the proportions of the selection thereby allowing you to create a perfect square or a perfect circle. If you press Alt Option on the Mac with either of these tools you can draw from the center out. If you press Alt Option on the Mac with the Lasso tool the Lasso temporarily becomes the Polygon Lasso tool. Unfortunately despite numerous requests the ability to read users minds wasn t a Version CS2 upgrade feature. The following sections show you what

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