Classic Color Meter is a enhanced replacement for Apple's DigitalColor Meter application. It restores all functionality previously available in OS X 10.6 Snow Leopard's DigitalColor Meter and adds many additional features:
• Display modes
    • RGB percentage
    • RGB decimal (both 8-bit and 16-bit)
    • RGB hexadecimal (both 8-bit and 16-bit)
    • Hue/Saturation/Brightness (HSB)
    • Hue/Saturation/Lightness (HSL)
    • Y'PbPr and Y'CbCr (both ITU-R BT.601 and ITU-R 709)
    • CIE 1931, CIE 1976, CIE LAB, and Tristimulus values
• Commands
    • Lock cursor position / X axis / Y axis
    • Adjust magnification (1x/2x/4x/8x)
    • Adjust aperture size
    • Show/hide cursor coordinates
    • Update preview continuously
    • Hold Color (allows editing of color in RGB and HSB modes)
    • Save/Copy preview image
    • Copy Color as Text, Image, or as a NSColor/UIColor/HTML/CSS code snippet
    • Paste Text as color
• Preferences
    • Adjust aperture color