Adobe Photoshop CS3 Manual de usuario descargar pdf (Pagina 199)

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PHOTOSHOP CS3

User Guide

192

Transform perspective while cropping

The Crop tool has an option that lets you transform the perspective in an image. This is very useful when working

with images that contain keystone distortion. Keystone distortion occurs when an object is photographed from an

angle rather than from a straight-on view. For example, if you take a picture of a tall building from ground level, the

edges of the building appear closer to each other at the top than they do at the bottom.

Steps to transform perspective

A. Draw initial cropping marquee B. Adjust cropping marquee to match the object’s edges C. Extend the cropping bounds D. Final image

1 Select the Crop tool and set the crop mode.

2 Dragthecroppingmarqueearoundanobjectthatwasrectangularintheoriginalscene(althoughitdoesn’tappear

rectangular in the image). You’ll use the edges of this object to define the perspective in the image. The marquee

doesn’t have to be precise—you’ll adjust it later.

Important: You must select an object that was rectangular in the original scene or Photoshop might not produce the

perspective transformation you expected.

3 Select Perspective in the options bar, and set the other options as desired.

4 Movethecornerhandlesofthecroppingmarqueetomatchtheobject’sedges.Thisdefinestheperspectiveinthe

image, so it is important to precisely match the object’s edges.

5 Drag the side handles to extend the cropping bounds while preserving the perspective.

Do not move the center point of the cropping marquee. The center point needs to be in its original position in order

to perform perspective correction.

6 Do one of the following:

• Press Enter (Windows) or Return (Mac OS), click the Commit button in the options bar, or double-click inside

the cropping marquee.

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Adobe Photoshop CS3 Manual de usuario Pagina 199

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