PPT98: How to Scale Bitmaps and Movies for Better Slide Shows (188946)

WORKAROUND

1. Determine the width/height ratio of the target display and the slide by using the following table. Standard slides have a width/height ratio of 1.33333:1. (The dimensions for display drivers are listed in pixels.)
   
   NOTE: This table is not comprehensive; it only contains a sampling of display resolutions as a reference.
   
   

   Display/Driver	Width	Height	Ratio
   Standard VGA	640	480	1.33333 : 1
   Macintosh Studio Display (Min)	640	480	1.33333 : 1
   Macintosh Studio Display (Max)	1,600	1,200	1.33333 : 1
   Macintosh Cinema Display (Min)	800	500	1.6 : 1
   Macintosh Cinema Display (Max)	1,600	1,024	1.5625 : 1
   Letter Paper	10"	7.5"	1.33333 : 1
   On-Screen	10"	7.5"	1.33333 : 1
   35mm Slides	11.25"	7.5"	1.5 : 1

   
   
   If you do not know the width/height ratio of your target display, use the appropriate method for your operating system to determine the width/height ratio.

   Microsoft Windows

   1. Click Start, point to Settings, and then click Control Panel.
   2. Double-click the Display icon.
   3. Click the Settings tab and note the screen resolution setting under Desktop area or Screen area.
   4. To calculate the width-to-height ratio for the display screen, divide the first number by the second number.
      
      For example, if the resolution listed is 1,280 by 1,024 pixels, the width/height ratio is 1,280 divided by 1,024, which equals 1.25. The width of the screen is 25 percent wider than it is tall.

   Macintosh

   1. On the Apple menu, point to Control Panels, and then click Monitors or Monitors and Sound.
   2. Click Monitor.
   3. Note the screen resolution that is selected under Resolution.
   4. To calculate the width-to-height ratio for the display screen, divide the first number by the second number.
      
      For example, if the resolution listed is 1,280 by 1,024 pixels, the width/height ratio is 1,280 divided by 1,024, which equals 1.25. The width of the screen is 25 percent wider than it is tall.
2. After you have determined the width/height ratio of the target display, compare it to the width/height ratio of the presentation. If the two are not equal, you must change the slide's height as necessary.
   1. On the File menu, click Page Setup.
   2. Calulate the new Slide Height as follows:

      Slide Height = Slide Width / (Width/Height Ratio)

      For example, on a Macintosh Cinema Display with a screen resolution of 800 x 500, a width/height ratio of 1.6:1, and a default height of 10 inches, use a slide height of 6.25 inches:

      Slide Height = 10" / 1.6 = 6.25"

   3. In the Height box, type the slide height that you calculated in the previous step, and then click OK.
      
      NOTE: If you change the slide height of an existing presentation, PowerPoint resizes all shapes to match the new slide size, which distorts images on all slides. Microsoft recommends that you change the slide height first, before you add any images or movies to your presentation.
3. In Slide view, click the video or bitmap that you want to resize.
4. On the Format menu, click Picture, and then click the Size tab.
5. Click Reset, and then click OK.
6. On the Format menu, click Picture, and then click the Size tab.
7. Click to select the Lock aspect ratio check box.
8. Click to select the Best scale for slide show check box.
9. In the Resolution list, click the resolution that most closely matches the resolution of the display on which the presentation will be shown.
10. Click to clear the Best scale for slide show check box.
11. Use the following formula to calculate the actual percentage to scale the image:

    Actual Percentage = ((Width in Pixels - 20)/Width in Pixels) * Current Percentage
    

    For example, if the current percentage for a Best scale for slide show of 800 by 600 is 120 percent, the actual percentage is 117 percent:

    ((800 - 20)/800) * 120% = Actual Percentage
    
    (780/800) * 120% = Actual Percentage
    
    0.975 * 120% = Actual Percentage
    
    117% = Actual Percentage

12. In the Width text box, type the actual percentage that you calculated in the previous step, and then click OK. Because you selected the Lock aspect ratio setting earlier, PowerPoint scales the image height proportionately.