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How to Resize an Image on Mac

Post processing is pretty much an essential part of photography. No matter how much time you spend taking a photo or how carefully you compose it, you still may have to tweak it a little in post. It doesn’t have to do with just color correcting images and fixing exposure. You may feel the need to resort to post processing even if you wish to accomplish a seemingly simple task like resizing your image.

What is Resizing?

Resizing images can mean more than one things. In order to physically resize your photo, you can either crop into it or enlarge it. But maybe you simply need to change the file size of your image, and not necessarily the aspect ratio or field of view that it has. In that case, you need to know how to change the resolution of your image to make it smaller. This is important if you like to post your photos online, as some social media platforms don’t allow images with huge file sizes to be uploaded.

Let’s take a look at both ways to resize an image on a Mac computer.

Crop to Make the Image Smaller

The quickest way to resize an image, if you need to make it smaller, is to crop it. Cropping an image can be done with almost every image editing program you have on you Mac. The easiest way to do it is to use Mac’s own Preview app. Simply open the image in Preview, go to Tools and select the Crop option to make your image smaller.

Cropping not only cuts into your image but also makes the overall size smaller. You can also use more advanced programs like Apple Photos or Luminar to crop your images. These programs give you a little more control over your images, but essentially their crop tools work the same way as that of Preview’s.

Enlarge Your Images in Luminar

The best way to enlarge your photos on a Mac is to use Luminar. You can essentially drag and increase the size of your photos in multiple image editors, but Luminar gives you more control over the output quality of your enlarged photos. In order to make your photos larger in Luminar, open the Image Size dialog and enter the desired Width and Height that you want your image to be. If you check the ‘Constrain Proportions’ box then Luminar will automatically adjust the height of the image according to the original aspect ratio.

The reason Luminar is better than most photo editors on your Mac for enlarging photos, however, is the number of resampling options you have while changing the Image Size. Clicking on the drop down menu at the bottom of the dialog will reveal the many ways in which you can ‘resample’ your image. While enlarging a photo, you are breaking each pixel into certain subpixels. To keep these added pixels from ruining the image quality, choose the option labeled Bicubic Smoother after you have resized your image.

Make the Image Size Smaller for Web

If all you need to do is to reduce the file size of your image, Luminar has got you covered there as well. Simply open your image in the software, navigate to File - Save for Web and Devices and you will see a number of options that you can change to strike the perfect balance between image size and quality.

These are some of the easiest ways that you can resize an image on your Mac. There are a plethora of software programs that you can use for these kind of purposes, and a little research about their features will reveal all that you can do with them. However, the methods mentioned here are some of the most efficient ones to achieve exactly what you want.

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