Easiest way to get and convert colors

You need to grab a color from an image, make it a little bit darker, and get the new hex value. You don't want to have to open a design program just to do that. With Hues, you'll be done before Photoshop has finished opening.

A fast, lightweight color picker app allows you to grab the color of any pixel on your screen. Built on top of the standard Mac OS X color picker that you're already familiar with. Whether you're a designer or developer, if you work with colors, you'll want Hues.

Features
View Hex, RGB, and HSL value for any color
Can select text or click button to copy values
Auto copy default value to clipboard after selecting
Input hex values
Customize format for each color representation
History menu of last 25 colors
Choose what color pickers to display
Works alongside existing color picker plugins