However you could choose HEIC, which is a space saving file type (it stands for High Efficiency Image Format) that should create an image that is smaller than a JPEG, but with the same quality. You can’t add pixels to an image so the only way to make an image larger without losing quality (which is determined by the number of pixels in a square inch) is to crop the image following the instructions above. Once you are happy click command + K and that will crop the image.Once you have the correct sized box un-click the mouse, and you’ll be able to move the box to prime position.You will see a little counter in the bottom right corner that shows how many pixels are selected. If you want the image to be a particular size, like 1,600 x 900 in the example above, you can drag the box to the dimensions you need.Click on the image in Preview and drag so that the blue box surrounds the part of the image you want to crop.
#Command line image resize mac how to#
If you want to crop an image it’s not immediately obvious how to do so because there isn’t a traditional crop tool in the menu, but it’s actually very easy. If you are trying to shrink the image to 500KB for example, you can keep adjusting until you are happy with the result here. (It may take a while to calculate the size.) If you open the Adjust Size menu as above you will notice that when you adjust the dimensions of the image you will see a preview of the size (in MB or KB) of the image before and after you have make your changes. If you are trying to make the size of the image smaller (perhaps so you can send it via email) there are a couple of ways you can do so. But what if it’s the size of the image – in terms of MB – you want to change? How to make an image smaller That will change the dimensions of the image, perhaps you need the width to be the same as the width of a webpage you are adding the image to, for example. Adjust either the Width number or the Height number – the other will automatically adjust proportionally.Choose whether you want to resize according to pixels, percent, inches, cm, mm or points.This means you can only change one dimension, length or width, but it means everything will be adjusted equally. Now, assuming want your image to look the same after – rather than stretched or squat, you need to make sure that Scale proportionally is selected.Choose Adjust Size (you can also open this menu by clicking on the square with arrows icon in the menu bar).Double click on the image – this should open the image in Preview, if it doesn’t, close it and right click to choose Open With and select Preview.Locate the image (either using the Finder, or on your Desktop).But at least I now know how to use Shortcuts. And if I fnd it too cumbersome, I can always re-do the workflow in Automator. I imagine that by spending a little bit more time I can fix this, if you know how to do that, ping me on Twitter 🙃 but it’s not a big deal, I can live with this. Unfortunately I didn’t find a way to save the JPG to the current folder and replace the file selected. Make sure you just set it to receive images by unselecting all the other file types in the first action:įinally, add a “Move File” action to save the converted file to the desktop:
In the settings tab on the right you can choose to use this shortcut as a Quick Action in the Finder, so you can right-click an image and you’ll see the option to convert it to JPG: Search “finder” and select the “Get Selected Files in Finder” action: Now on the right you can choose an action. In this post I want to describe how to do the first.Ĭlick the + button, or from the menu select File -> New Shortcut. I just have this one to convert any image to JPG, and another one to resize the images to 1200px. I never had the need to do anything fancy.īut since moving to a new Mac, I decided to re-do my little automations. I’ve never used this app on those platforms. MacOS Monterey, the latest macOS version, comes with a tool that’s basically going to replace Automator in the future, I think, and has been available in iOS and iPadOS for some time: Shortcuts.
(PNG is nicer because of transparent background, but there’s a balance between file size and beauty).
Sometimes converting an image to JPG can mean a 5x reduction in size in some cases. It’s something I do all the time, because the difference between PNG images and JPG for some things is huge. For the longest time I’ve had an Automator script to convert images to JPG.
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