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How to change image dimensions in Photoshop

In this class we’re going to learn how to change image dimensions in Photoshop, as well as the image’s resolution, if necessary.

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This is an easy tutorial for absolute beginners, but extremely important if you want to know how to edit and improve Architecture renders.

Most render backgrounds and skies come too large in size for a simple render, and usually at resolutions up to 300 dpi, which can cause troubles in your computer.

The best thing we can do is to reduce the background dimensions and resolution to fit you render, so we can work faster and efficiently; besides, your computer will thank you, because you will liberate a lot of working memory.

In this example we’ll use the image below, which has dimensions of 4864 x 3492 pixels and 300 dpi resolution. Click on the image to get the full version and then save it in your computer for this exercise.

Skies for Render - Cielos para Render

I want this pic to be at the background in a render which dimensions are 1920 x 1080 pixels. I want to lower the image’s resolution from 300 to 72 dpi too, as this is the normal resolution in a normal render.

The process to lower dimensions and resolution in an image is quite simple.

Start by opening the image in Adobe Photoshop. Click on “Image” and then on “Image Size” so we can see its respective window.

In this window you can see all the information about the image. In “Resolution”, change the value to 72 and make sure the field at the right is in “Pixels/Inch”.

In “Width”, change the value to 1920, and make sure the field at the right is in “Pixels”. (Look at the pic below).

How to change image dimensions in Photoshop

As you can see in “Height”, the value changes automatically as you change the width of the image, because the aspect ratio function is activated.

Click on OK to accept these values.

Resolution and Width are right now, but we need to adjust the image’s height from 1378 to 1080 pixels.

To achieve this, click on “Image” and then on “Canvas Size”.

In this window, in “Anchor”, click on the central arrow at the bottom of the box. In “Height”, change the value to 1080, as you can see at the image below.

How to change image dimensions in Photoshop

Now, click on OK to accept these values. Photoshop is giving you a warning about the size of the image, click on “Proceed” to continue, and the image is now perfect.

Well this tutorial on how to change image dimensions in Photoshop is successfully finished. The 1920 x 1080 background we needed is ready to work.

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