If you are going to use graphics in your distance education presentation you need to check four areas to make sure the graphics retain as much quality as possible. NTSC television is the standard used in the United States, Canada, and Japan. To make sure that your colors will conform to this standard, check your graphics in Adobe Photoshop. Click on Filter in the menu bar, select Video, then select NTSC Colors. Photoshop will look for illegal colors and automatically substitute the nearest legal equivalent.
TVs have trouble with bright, heavily saturated colors like brilliant reds and yellows.
These colors will tend to bleed and may even cause an audible buzzing or humming. In the past, as TV picture tubes aged, the image shrank. The television sets were made to overscan the image to compensate as the tubes aged to give them a longer life. A computer monitor underscans to avoid cutting off pixels. Most video-editing programs will show you where the safe zone for your display is, otherwise trial and error can be your guide.