For example, if you've saved a presentation and the default 220 ppi compression in PowerPoint options is set, you won't be able to compress an image again using 330 ppi (HD). If a picture has already been compressed, higher-resolution compression options may not be available. HD options (such as 330 ppi) are available in newer versions for high-definition displays. Choose Print (220 ppi) if you intend to print. Use Web (150 ppi) if you plan to post your presentation online or project it. Select E-mail (96 ppi) for maximum compression. Select the target output resolution that is most appropriate for the way you want to use the file. Choose the desired document resolution.Select the check box to Delete cropped areas of pictures if you have cropped images and want to permanently delete the areas you have removed by cropping.Select the check box to Apply only to this picture if you want to compress only the current picture or uncheck this option if you want to compress all pictures in the presentation.In the Adjust group, click Compress Pictures.
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