Color Scheme Designer 3     http://colorschemedesigner.com/     tags: color ColorWiki - Delta E: The Color Difference     You don't have to spend too long in the color management world before you come across the term Delta-E. As with many things color, it seems simple to understand at first, yet the closer you look, the more elusive it gets. Delta-E (dE) is a single number that represents the 'distance' between two colors.     http://www.colorwiki.com/wiki/Delta_E:_The_Color_Difference     tags: color visualization hci Particletree » Calculating Color Contrast for Legible Text     Color difference is determined by the following formula:     http://particletree.com/notebook/calculating-color-contrast-...     tags: hci ui color viz Chris Harrison - Color Flower     color flower viz, may have used mechanical turk to gather data, has very high res image     http://www.chrisharrison.net/projects/colorflower/index.html     tags: color poster