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Batch resize images in Preview Apps
I needed a quick way to resize images in batches, and was pleased to find that Preview has that functionality. Open the whole batch of images in Preview; the images will all open in the same window with thumbnails visible in the sidebar.

Select all of the thumbnails in the sidebar (with Command-A, or click the first and then click the last while holding Shift). Next, from the Tools menu, choose Adjust Size. You'll be presented with a dialog containing options to resize to all the common 4:3 and 16:9 screen sizes, as well as the option to define custom dimensions. Images are scaled proportionately and resampled by default.

Save the resized images, and you're done! Preview will prompt you to save any changes if you attempt to close the window.

[robg adds: This works in both 10.5 and 10.6; the Rotate and Flip tools also work on multiple selections.]
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Batch resize images in Preview
Authored by: patniemeyer on Dec 07, '09 08:17:01PM

You can also use sips on the command line. e.g.

sips -Z 1024 *.jpg // resample to a max of 1024 px for the long edge

Note that sips rewrites images in place, so you should do this on a copy if you care.

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Batch resize images in Preview
Authored by: googoo on Dec 09, '09 06:39:43AM
You can also use the ImageMagick command convert to make all kinds of batch changes on the command line. Fire up the terminal and enter the command man convert for more information.


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