Add or replace scale markers, Delete a scale marker, Performing a measurement (photoshop extended) – Adobe Photoshop CS4 User Manual
Page 616
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USING PHOTOSHOP CS4
3D and technical imaging
Last updated 1/10/2010
Text position
Displays caption above or below the scale marker.
Color
Sets the scale marker and caption color to black or white.
3
Click OK.
The scale marker is placed in the lower left corner of the image. The marker adds a layer group to the document,
containing a text layer (if the Display Text option is selected) and a graphic layer. You can use the Move tool to move
the scale marker, or the Text tool to edit the caption or change text size, font, or color.
For a video on understanding and using the measurement features, see
.
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 can 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 panel, 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 type 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 “
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 “
measurement scale (Photoshop Extended)
” on page 607), 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.