Adobe 13102498 User Guide - Page 251

244 Chapter 9: Selecting If you want to apply changes to parts of an image, you first need to select the pixels that make up those parts. You select pixels in Adobe Photoshop CS3 using the selection tools or by painting on a mask and loading the mask as a selection. To select and work with vector objects in Photoshop, you use the pen selection and shape tools. This chapter covers pixel selection tools and techniques. Making selections About selecting pixels A selection isolates one or more parts of your image. By selecting specific areas, you can edit and apply effects and filters to portions of your image while leaving the unselected areas untouched. Photoshop provides separate sets of tools to make selections of raster and vector data. For example, to select pixels, you can use the marquee tools or the lasso tools. You can use commands in the Select menu to select all pixels, to deselect, or to reselect. To select vector data, you can use the pen or shape tools, which produce precise outlines called paths. You can convert paths to selections or convert selections to paths. Selections can be copied, moved, and pasted, or saved and stored in an alpha channel. Alpha channels store selections as grayscale images called masks. A mask is like the inverse of a selection: it covers the unselected part of the image and protects it from any editing or manipulations you apply. You can convert a stored mask back into a selection by loading the alpha channel into an image. Note: To select a specific color or a range of colors within an entire image or within a selected area, you can use the Color Range command. See also "About masks and alpha channels" on page 269 "Create and edit alpha channel masks" on page 272 "Convert paths to selection borders" on page 379 "Selection tools gallery" on page 27 Select, deselect, and reselect pixels You can select all visible pixels on a layer or deselect any selected pixels. If a tool is not working as expected, you may have a hidden selection. Use the Deselect command and try the tool again. Select all pixels on a layer within the canvas boundaries 1 Select the layer in the Layers palette. 2 Choose Select > All.