• Change canvas size
    Choose Image → Canvas Size from the menu.
    The Canvas Size dialog box appears. The current size of your canvas appears at the top of the dialog box.
    Modify the size as per you wish.
  • Rotate Layer
    First, go to File–>Open and select your image. You will see it opens into a new window with the title of your image on the header.
    Drag this image on your new blanck canvas using drag tool.  A layer can be rotated using a tool called free transform. There are two ways to engage this tool, 1) Go to Edit–>Free Transform, 2) Hit CTRL +TAssuming the free transform tool is on and your layer is selected, you should see anchor points around the canvas. This is similar to an image when you are trying to resize or edit it. Now, to rotate it you need to hover your mouse over one of the four corners. You should see a half moon shaped line with an arrow on either end. Click while your mouse pointer looks like this and slowly move your mouse in the direction you want your image to rotate.
  • Resize Layer
    A layer can be resized using a tool called free transform. There are two ways to engage this tool, 1) Go to Edit–>Free Transform, 2) Hit CTRL +T. Option two is called a shortcut.Assuming the free transform tool is on and your layer is selected, you should see anchor points around the canvas. This is similar to an image when you are trying to resize or edit it. If you click on a corner anchor point and drag it inward to a central point, the layer will begin to shrink both vertically and horizontally. It won’t stay perfectly proportional unless you hold down SHIFT while you drag. Likewise, if you grab a horizontal anchor point (either on the top or the bottom) and drag it towards the center, the height will decrease and if you grab it away from the center, you’ll increase the height.
  • Change Default Unit from Inches to Pixels
    Go to Edit –> Preferences –> Units & Rulers

    Change Rulers units to pixels (or whatever you wish), and then click OK button to save your preference.

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