Coloristic

Coloristic is a simple utility which magnifies the area of the screen surrounding the cursor. It will also display the color value for the pixel that is exactly under the cursor and allow you to copy that color value to the clipboard. In addition, you can measure the distance between any two pixels on screen, and save the magnified image to a file or the clipboard.

What is new in this release:

Version 1.7 has added histogram support and support to scroll locked images by using the Option/Control key.