The easiest way to do it is to use Mac’s own Preview app. Cropping an image can be done with almost every image editing program you have on you Mac. The quickest way to resize an image, if you need to make it smaller, is to crop it. Let’s take a look at both ways to resize an image on a Mac computer. 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. In that case, you need to know how to change the resolution of your image to make it smaller. 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 order to physically resize your photo, you can either crop into it or enlarge it. Resizing images can mean more than one things. You may feel the need to resort to post processing even if you wish to accomplish a seemingly simple task like resizing your image. It doesn’t have to do with just color correcting images and fixing exposure. 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. Post processing is pretty much an essential part of photography.
