Bright colors tend to over-saturate on TV, bleeding across scan lines. Adobe Photoshop and other graphics tools contain a filter to scan images for such colors and reduce their brightness to a level appropriate for TV display. In the following illustration, the colors on the left are too bright for display on most televisions. On the right are the same colors after the Photoshop filter is applied.
Only a small percentage of available RGB colors are too bright for TV viewing. Most colors will be unaffected by this filter. To run the filter, open an image in Photoshop and, on the Filter menu, point to Video and click NTSC Colors.
Pure white and pure black tend to display poorly on TV. Replace white with RGB(240,240,240) and black with RGB(16,16,16).