PPT: How to Scale Bitmaps and Movies for Better Slide Shows

MORE INFORMATION

1. Determine the width/height ratio of the target display and the slide using the following table. (The dimensions for display drivers are listed in pixels.)

         Display/Driver    Width   Height   Ratio
         ----------------  -----   ------   -------
         Standard VGA      640     480      1.33333
         Macintosh Plus    512     384      1.33333
         Macintosh E-Mac   832     624      1.33333
         Macintosh PBook   640     400      1.6
         PP3 Letter Paper  10.5    7.5      1.33333
         PP3 On-Screen     10.5    7.5      1.33333
         PP3 35 mm         11.25   7.5      1.5
   						

   If you do not know the width/height ratio of your target display, you can do the following:

         Windows:   Use the Microsoft Paint utility to examine the default
                    Image Attributes on the target computer. Consult
                    your "Microsoft Windows User's Guide" or the Help
                    utility in Paint for additional information.
   
         Macintosh: Consult the display hardware documentation or the
                    manufacturer of your display card, or use a
                    third-party utility, such as TattleTale, to get this
                    information.
   						

2. Determine the pixel resolution (pixels per display inch) of the display.
   
   NOTE: For the following calculations, the horizontal pixel resolution and vertical pixel resolution are assumed to be identical (square pixels). Standard values are:

         Windows:   Pixel resolution = 96 dpi
         Macintosh: Pixel resolution = 72 dpi
   						

3. Determine the scaling factor by comparing the width/height ratios of the target display and slide size (you can find the slide size by clicking Slide Setup on the File menu) and using one of the following formulas.
   
   If target display ratio is greater than or equal to the slide ratio, use the following formula:

                                           Pixel resolution(pixels/inch)
      Scale % = 100 * Slide Height(inch) * -----------------------------
                                               Display Height(pixels)
   						

   Example for VGA: 150% = 100 * 7.5 * (96 / 480)
   
   If the target display ratio is less than or equal to the slide ratio, use the following formula:

                                          Pixel Resolution(pixels/inch)
      Scale % = 100 * Slide Width(inch) * -----------------------------
                                              Display Width(pixels)
   						

   Example for Mac Plus: 197% = 100 * 10.5 * (72 / 384)
4. Make sure that the object to be scaled is at its original proportions by doing the following:

      Windows:   Hold down SHIFT and double-click one of the object's
                 resize handles.
   
      Macintosh: Hold down SHIFT+OPTION and double-click one of the
                 object's resize handles.
   						

5. Use the Scale command to scale the object using the scaling percentage calculated in step 3.