How To 

How To Adjust An Image’s Canvas Size In Photoshop

Sometimes you might find yourself with a perfect image for a project but it unfortunately its aspect ratio doesn’t fit the dimensions needed for the work. This could be an image shot in landscape that needs to print to A4 or a square image that needs to be cropped down to 16:9. Whatever the reason, the Canvas Size tool allows you to easily change an image’s size and aspect ratio to fit the dimensions of a project. Here’s how you use it.

1. Open the “Canvas Size” dialog box.
In this example, we’re going to add space to this skyline photo so that it fits a taller aspect ratio. To begin this process, we’ll hit “Image > Canvas Size…” to open a dialog box.

2. Adjust the “Canvas Size” parameters.
While you can use this tool to crop an image, we’re going to increase the height of the image from the bottom up so that sky extends higher. To do this, we’ll first adjust the “Anchor” so that the expansion occurs from the bottom. Then we’ll increase the height by changing the value in the “Height” bar. We also have the option to change the increments (pixels, centimeters, percentage), but we’ll stick with “inches”. Once we’re done, we’ll hit “OK”.

3. Select the newly created blank area.
The image area has now expanded from bottom up, which has unfortunately created an area of empty space above our original photo. To change this, we’ll first select the area with the magic wand tool.

4. Open the “Content-Aware Fill” command.
There are multiple ways to fill this space, but for the sake of simplicity we’ll be using the “Content-Aware Fill” that we’ve discussed in a previous tutorial. To open it, simply click “Edit > Content-Aware Fill…”

5. Adjust the Content-Aware Fill parameters.
To make the added sky feel more organic, we’re going to begin by using the workspace’s lasso tool to increase the selection area so that extends down the edges of the image. We’ll then set the Color Adaptation, Rotation Adaptation, Scale, and Mirror settings so that the sky completely and naturally fills the empty space.

6. Create a new layer to fill the blank space.
Once we’re done adjusting the Content-Aware Fill settings, we’ll set the Output to “New Layer” and click “OK”. This will create a new layer on top of our original image that will serves as an extension of the sky.