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Change image file size mac


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The New Folder action is put in place at the beginning of the workflow with some options on the action box. Enter a name for the new folder in the Name box. By default, this new folder will be created on the Desktop.


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Now, we need to tell Automator to select the images to modify. Next, drag the Get Folder Contents action to the bottom of the workflow. Under Library , select Photos , and then drag the Change Type of Images action to the bottom of the workflow. The New Folder action will take care of that.

On the Change Type of Images action box in the workflow, select the desired image format from the To Type dropdown list. Under Library , select Photos. Next, drag the Scale Images action to the bottom of the workflow. Select whether you want to convert the images to a specific size in pixels To Size pixels or using a percentage By Percentage from the dropdown list.

Enter the number in pixels or the percentage in the box. Using pixels may give you strange results.

Navigate to where you want to save your app and enter a name for the app in the Save As box at the top of the dialog box. Next, click Save. To convert and resize a batch of images, select the image files and drag them onto the app icon on the Dock. Depending on the number and size of the selected images and the speed of your Mac, after a few seconds or minutes, a new folder is created on your Desktop containing the converted and resized images.

Your original files are preserved. There are also third-party apps you can install to convert and resize your images. Here are a few for you to consider. XnConvert is a free program that makes it easy to batch convert and resize images, as well as perform many other actions on images, like rotate and crop, adjust brightness, contrast, and saturation, apply blur, emboss, and sharpen filters, and add masking and watermarking effects.

Add your images on the Input tab. Next, add an action on the Actions tab to resize the image by pixels, percent, inches, cm, or mm and specify the Width and Height values. On the Output tab, select the folder for the converted files and select format you want to convert to. You can also customize the file names as well as change some other options. ImageSize is a free app with a paid option to get additional features. Each time the quality will get worse. The traditional choice of file type for graphics consisting of simple areas and few colors is GIF, although one can now achieve the same results with a PNG-8 and at a smaller file size.

GIF images are limited to colors, but you can set a lower color depth for substantial savings in file size.

How to batch resize your image collection using Preview in macOS

For the best results try to get at or just under one of the following numbers of colors: , , 64, 32, 16, 8, 4, or 2. When you save or export as a GIF, first select the number of colors you want in your final image. There are a few settings you can ignore. And, of course, GIF has been the traditional choice for animated images, although PNG is poised to take over that area as well.

We finally get to PNG. Exporting as a PNG The only significant difference is that the PNG-8 will be slightly smaller.

How to Resize a Photo on Mac

The file size is Unlike a JPG, no image information is discarded. That also means the file size can be quite large. Its file size is KB.

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Its file size is only 69 KB. A good example is a screenshot that includes lots of small type.

Confining the Image

The PNG will reproduce the type pixel-by-pixel just as it appeared originally on the screen. To resize an image with PhotoBulk :. Sometimes you need to resize multiple images at once. Although probably not your best option, Preview does allow for batch resizing:. The downside of using Preview for batch resizing is that you have to process all the images at the same time. PhotoBulk, on the other hand, provides much more control and the ability to modify the size of individual images without needing to apply those same dimensions to every image:.

Overall, whichever option you choose for resizing images, Preview or PhotoBulk, it should now be fairly easy for you to do so.

Resizing Multiple Images at Once on Your Mac

Your best bet is probably to use Preview for single images and PhotoBulk for multiples ones. Just make sure you input the right dimensions and don't forget to save the original if you need to keep a higher resolution version for later. Best of all, PhotoBulk is available for a free trial through Setapp , a platform of over useful apps and utilities for macOS.

Another trick up your sleeve. To resize an image with PhotoBulk : Open up the app Drag and drop your image onto the window Check Resize option from the left-side menu Select the type of resizing you need Click Start Resize multiple images at once Sometimes you need to resize multiple images at once.

PhotoBulk, on the other hand, provides much more control and the ability to modify the size of individual images without needing to apply those same dimensions to every image: Drag and drop a bunch of images into PhotoBulk Check the Resize box Use the dropdown menu to adjust images according to width, height, etc.