[Learn] How to batch resize several images on Mac OSX with iPhoto

Have you ever need or have been asked to resize several images and had to resort to a photo editing software to individually resize those images? Well, it is an effective way of doing that, but what if you had to resize a hundred of them?

Well, today I had to resize 40 photos, and thought that doing it in Photoshop would be crazy, so I did a little research.

Turns out iPhoto has this function. It is indeed very nice and useful.

First you need to import your photos into iPhoto by going [ File > Import to Library... ], then just select your photos or the folder you have your photos in.

After importing,  your photos will be in the “Library” folder of iPhoto, so you have to search for it and sort them into different sub-folders if you want to. Unfortunately, you cant specify a sub-folder while importing. You have to do it afterwards.

Select the photos you want to resize, then go [ File > Export... ]. You will be presented with a dialog box. Choose a format you want to export to (not Original), and click the “Scale images no larger than: ” radio button. Specify the width or height you want, the aspect ratio will be preserved(!). Then click “OK”. Select the directory you want, wait for a few seconds, and voila! Instant resized images, with preserved ratios, at the specified maximum width or height.

Tip: When your images have different aspect ratios (some of them are much longer than others, or wider), select the ones with similar ratios first, export them, and export the longer/wider ones later.