Adobe 13102498 User Guide - Page 244

PHOTOSHOP CS3 237 User Guide 7 Drag over the area of the image you want to paint. Hold the Shift key down to drag a straight line that conforms to the plane's perspective. You can also click a point with the Stamp tool and then Shift-click another point to paint a straight line in perspective. Measure in Vanishing Point (Photoshop Extended only) Users ranging from architects and interior decorators to forensic scientists and woodworkers often need to know the size of objects in an image. In Vanishing Point, the Measure tool lets you draw a measurement line over an object in a perspective plane that you know the size of. The Measure tool has an option for entering a length for the measurement. The measurement line displays two text boxes: one for the length and one showing the angle that the line was drawn relative to the perspective plane. Once the measurement and its length have been set, all subsequent measurements correctly scale to your initial measurement. For a video on using Vanishing Point, see www.adobe.com/go/vid0019. There's an option for linking the line's measurement length with the grid spacing of the perspective plane. For example, a measurement length of 5 causes the grid to display 5 spaces, when the link option is selected. This might be useful for visualizing sizes in the image or for counting objects in an image. When unlinked, the grid spacing can be adjusted independent of the measurement. This option is useful in such instances where you find that the grid spacing is too small and visually confusing when linked to the measurement. The measurements you create can be rendered so they appear in the image after you close the Vanishing Point dialog box. You can also export your measurements and geometric information to formats that can be read by CAD applications. See also "Keys for using Vanishing Point" on page 637 Measure objects in an image 1 In Vanishing Point, select the Measure tool and then click and drag over an object in a plane. It's best to make your initial measurement of an object that you know the size of. Note: Once you start creating a measurement from within a plane, it possible to continue drawing the measurement beyond the plane boundaries. 2 With a measurement selected, enter a Length value to set its measured length. 3 (Optional) Draw additional measurements. The size of these measurements are scaled to the size of your initial measurement. 4 (Optional) Do one of the following: • If you want the size of the grid to be independent of the Length value you assigned to the initial measurement, make sure Link Measurements To Grid is deselected. This is the default setting. • If you want the size of the grid to adjust according to the Length value you assigned to the initial measurement, select Link Measurements To Grid. Vanishing Point measurements in an image are preserved after closing the dialog box. They appear when you launch Vanishing Point again.