Photoshop

Set the measurement scale (Photoshop Extended)

Use the Ruler tool to set the measurement scale for a document. You can create measurement scale presets for frequently used measurement scales. Presets are added to the Analysis > Set Measurement Scale submenu. The current measurement scale for a document is checked in the submenu, and appears in the Info palette.

Choose Analysis > Set Measurement Scale > Default to return to the default measurement scale, 1 pixel = 1 pixel.

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 palette, choose Palette Options from the palette 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.