Adobe Photoshop CS3 Manual de usuario descargar pdf (Pagina 251)

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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.

Photoshopprovidesseparatesetsoftoolstomakeselectionsofrasterandvectordata.Forexample,toselectpixels,

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.

Toselectvectordata,youcanusethepenorshapetools,whichproducepreciseoutlinescalledpaths.Youcanconvert

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

andprotectsitfromanyeditingormanipulationsyouapply.Youcanconvertastoredmaskbackintoaselectionby

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.

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