Adobe 13102498 User Guide - Page 606

PHOTOSHOP CS3 599 User Guide Add or replace scale markers You can place multiple scale markers in a document, or replace existing markers. Note: Additional scale markers are placed in the same position on the image and may obscure each other, depending on their length. To view an underlying marker, turn off the scale marker layer set. 1 Choose Analysis > Place Scale Marker. 2 Click Remove or Keep. 3 Enter settings for the new marker and click OK. Delete a scale marker 1 In the Layers palette, select the Measurement Scale Marker layer group for the scale marker you want to delete. 2 Right-click the layer group and select Delete Group from the context menu, or click the Delete Layer button. 3 Click Group and Contents. Performing a measurement (Photoshop Extended) You can measure using the Photoshop selection tools, Ruler tool, or Count tool. Choose a measurement tool that matches the kind of data you want to record in the Measurement Log. • Create a selection area to measure values such as height, width, perimeter, area, and pixel gray values. You can measure one selection or several selections at once. • Draw a line with the Ruler tool to measure linear distance and angle. • Use the Count tool to count items on the image, then record the number of items (see "About counting (Photoshop Extended)" on page 603). Each measurement measures one or more data points. The data points you select determine the information recorded in the Measurement log. Data points correspond to the type of tool you're measuring with. Area, perimeter, height, and width are available data points for measuring selections. Length and angle are available data points for Ruler tool measurements. You can create and save sets of data points for particular types of measurements to speed your workflow. 1 Open an existing document. 2 Choose Analysis > Set Measurement Scale and choose a measurement scale preset for the document (see "Set the measurement scale (Photoshop Extended)" on page 597), or choose Custom and set a custom measurement scale. Measurements are computed and recorded in the Measurement Log using the scale units in effect when a measurement is recorded. If no measurement scale exists, the default scale is 1 pixel = 1 pixel. 3 (Optional) Choose Analysis > Select Data Points and do one of the following: • Choose Custom to select data points to measure. • Select an existing data point preset from the submenu. For a video on understanding and using the measurement features, see www.adobe.com/go/vid0029. In the Select Data Points dialog box, data points are grouped according to the measurement tool that can measure them. The Common data points are available for all tools. They add useful information to the Measurement Log such as the name of the file being measured, the measurement scale, and the date/time of the measurement. By default all data points are selected. You can select a subset of data points for a particular kind of measurement and save the combination to make it available as a data point preset.