Suggested colour schemes.
Dither-proof Colour Wheel (large page).
Launch the Table of Web-Safe colours.
Launch the Table of iTV-Safe colours.
Color Balance. Generate a table of colors that can be safely displayed next to each other on TV.
Color Difference. Calculate the chrominance difference between two RGB colors.
Courtesy of Liberate © . Best viewed on a TV set, but also useful for web development.