Gpick

            
            Gpick is an application that allows you to sample any color from anywhere on the desktop, and use it to create palettes (i.e. collections of colors) for use in graphic design applications. Gpick also has other features that help in the creation of color palettes, such as:

    The ability to create a palette from an imported image
    Automatic naming of colors
    Color scheme generator
    Import and export from various file formats