Adobe Photoshop Rulers are really useful when you crop, combine or edit your images. Depending on what you are doing you might want them to display pixels, percentages or even inches. Here's how to change their units.
How to display rulers
Photoshop rulers are displayed outside the image.
If you don't see the rulers on the edge of your document, go to View> Rulers, ou use the keyboard shortcut Ctrl + R (Command + R on a Mac).
You can hide the rulers if you don 't need them. Use the same commands.
How to change rule units
These rulers display pixels and inches.
Adobe Photoshop supports seven types of units:
- Picas (1 pica = 12 points)
The fastest way to change between them is to right click on a rule and select the desired option from the scrolling menu.
You can also change the unit through Photoshop's preferences pane. Go to Edit> Preferences> Units & Rulers. (On a Mac, go to Photoshop> Preferences> Units and rules.)
Under "Units ", click the "Rules " drop-down menu, then select the units you want to use.
Can you change the default rule units?
Unfortunately, there is no way to change the default ruler units or set them to match the measurements of your images. Photoshop remembers the last unit you used.
Can you set different rule units for different documents or presets?
Again, unfortunately no - you cannot set different rule units for different documents in the application. The rule unit is a global parameter. If you edit it in a Photoshop document, it is edited in all Photoshop documents.
(Yes, it 's very annoying if you edit images and have print designs at the same time.)