PowerPoint automatically compresses images when saving a presentation. This is generally “a good thing” in that it reduces the size of your file. However, if you are using high resolution photos, you may not want to lose that definition. You can prevent PowerPoint from compressing images in a presentation by following these steps:

  1. Select “Save as
    The “Save as” dialog box is displayed
  2. Click on “Tools” at the bottom left of the box
    Save options will be displayed
  3. Select the “Compress Pictures” option
  4. Click on the “Options” button
  5. Uncheck theĀ “Automatucally perform basic compression on save

Click here to see a video clip of this operation.