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How to resize a picture on Mac

1. Locate the picture in the Mac file system that you want to resize.

2. Open the image file you want to resize into Preview on the Mac, since Preview is typically the default image viewer you can just double-click a picture in Finder to launch into it.

3. Pull down the “Tools” menu and choose “Adjust Size”.

4. At the ‘Image Dimensions’ screen choose the new width and height in pixels (or inches, cm, mm, points, as a percent) to resize the picture to, to scale and resize proportionally be sure the “Scale proportionally” option is checked – click on “OK” when satisfied with the new image dimensions to resize to.

5. The image in Preview will instantly resize to the resolution dimensions chosen in the prior step, if unsatisfied repeat the above steps to resize the picture again, otherwise move to the next step.

6. Once satisfied with the resized picture, go to the “File” menu and choose either “Save” to save the resized image over the existing file, or choose “Save As” to save the freshly resized image as a new separate image file.

7. Assuming you chose “Save As” pick a new file name, choose a file destination, select the appropriate file format, and optionally adjust the image quality, then click on “Save” to save the resized image.


The newly resized picture will be where you saved it to the Mac Finder, or it will be the old file if you saved over the existing image.

最後更新：2017-05-22 21:35:43

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