Change Canvas Size to

(_) Method 1: Set border dimension in pixels
(_) Method 2: Set total canvas dimension
(_) Method 3: Set target aspect ratio enlarging the image

Method 3 enlarges the image
  • using the selected background color
  • using the anchor settings from method 2
  • so to fulfill the required target aspect ratio

Typical ARs are 4:3, 3:2, 16:10, 16:9, but also 32:9 or 48:9.

This is much easier than using the calculator and setting the dimensions manually.