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Compressing Images
Having an image that is too large (that is, too high a dpi) is not a problem quality-wise. You can resize it in PowerPoint to make it appear as small as you like; just drag its selection handles. There will be no loss of quality as it gets smaller. However, as I mentioned earlier, having a picture that is much larger than needed can increase the overall size of the PowerPoint file, which can become problematic if you plan to distribute the presentation on floppy disk or over the Internet.To avoid problems with overly large graphic files, you can compress the images to reduce their resolution. You can do this from within PowerPoint or with a third-party utility.| Tip | Here's a good tutorial for more information about working with graphics in PowerPoint: www.powerpointbackgrounds.com/powerpointgraphics. |
Reducing Resolution and Compressing Images in PowerPoint
PowerPoint offers an image compression utility that will compress all the images in the presentation in a single step and reduce their resolution to the amount needed for the type of output you specify (Web or Print).To reduce resolution and compress images, do the following:
Click a picture, so that the Picture Toolbar appears. If it does not, right-click on the image and choose Show Picture Toolbar.
Click the Compress Pictures button. The Compress Pictures dialog box appears (see Figure 8-14).
Click All Pictures in Document (assuming you want to compress them all).
Click Web/Screen if the presentation will be shown on-screen (to set each picture's resolution to 96 dpi), or click Print if it will be printed (to set each picture's resolution to 200 dpi).
The Compress Pictures checkbox is marked by default; leave it marked. All versions of PowerPoint (97 and higher) will open presentations that use compressed pictures.
The Delete Cropped Areas of Pictures checkbox is marked by default; leave it marked unless you plan on uncropping one or more of the images at some point.
Click OK to apply the settings.
Figure 8-14: Compress the pictures here to make the PowerPoint file smaller.
The preceding steps accomplished several separate things, as you may have noticed. It enabled compression, it reduced the resolution, and it deleted cropped areas. Each of these decreases the file size in a different way; they work together to achieve maximum results.
Reducing Resolution with a Third-Party Utility
Working with resolution reduction from an image-editing program is somewhat of a trial-and-error process, and you must do each image separately.You can approximate the correct resolution by simply "doing the math." For example, suppose you have a 10" × 7.5" slide. Your desktop display is set to 800 × 600. So your image needs to be 800 pixels wide to fill the slide. Your image is a 5" × 3" image, so if you set it to 200 dpi in an image-editing program, that gives you 1,000 pixels, which is a little larger than you need but in the ballpark.Want something a little easier? There are a number of third-party image compression utilities specifically for PowerPoint. Check out these, both of which make your presentation file smaller by optimizing image sizes and resolutions and compressing images where possible:
RnR Presentation Optimizer: www.rdpslides.com/pptools/FAQ00013
NXPowerLite: www.nxpowerlite.com
