Adobe Photoshop CS4 - Manual (Page 615)

608 USING PHOTOSHOP CS4
3D and technical imaging
Last updated 1/10/2010
Set measurement scale
1 Open a document.
2 Choose Analysis > Set Measurement Scale > Custom. The Ruler tool is automatically selected. Drag the tool to
measure a pixel distance in the image or enter a value in the Pixel Length text box. Your current tool setting is
restored when you close the Measurement Scale dialog box.
3 Enter the Logical Length and Logical Units that you want to set equal to the Pixel Length.
For example, if the Pixel Length is 50, and you want to set a scale of 50 pixels per micron, enter 1 for Logical Length,
and microns for the Logical Units.
4 Click OK in the Measurement Scale dialog box to set the measurement scale on the document.
5 Choose File > Save to save the current measurement scale setting with the document.
To display the scale in the Info panel, choose Panel Options from the panel menu , and select Measurement Scale
in the Status Information area.
To display the measurement scale at the bottom of the document window, choose Show > Measurement Scale from
the document window menu.
Create a measurement scale preset
1 Open a document.
2 Choose Analysis > Set Measurement Scale > Custom.
3 Create a measurement scale.
4 Click Save Preset and name the preset.
5 Click OK. The preset you created is added to the Analysis > Set Measurement Scale submenu.
Delete a measurement scale preset
1 Choose Analysis > Set Measurement Scale > Custom.
2 Select the preset you want to delete.
3 Click Delete Preset and click OK.
Use scale markers (Photoshop Extended)
Measurement scale markers display the measurement scale used in your document. Set the measurement scale for a
document before creating a scale marker. You can set the marker length in logical units, include a text caption
indicating the length, and set the marker and caption color to black or white.
Create a scale marker
1 Choose Analysis > Place Scale Marker.
2 In the Measurement Scale Marker dialog box, set the following options:
Length Enter a value to set the length of the scale marker. The length of the marker in pixels depends on the
measurement scale that is currently selected for the document.
Font Choose the font for the display text.
Font Size Choose the font size for the display text.
Display Text Select this option to show the logical length and units for the scale marker.