Often designers get so used to Adobe Photoshop’s interface that anything different feels totally alien. This is where you might find Photoshop-like Color Picker useful.
The idea behind Photoshop-like Color Picker is to give designers the familiar look and feel of Photoshop’s color picking tool.
Photoshop-like Color Picker is not exactly a color picker, in the sense that it cannot pick or sample colors from the screen like the Photoshop color picker or some of these desktop color picker programs can. It is just a simple tool to help you find the right colors for your designs by picking colors from the color window and adjusting RGB/CMYK or HSB (Hue, Saturation, Brightness) values, and getting the corresponding hex color codes.
Photoshop-like Color Picker weights just 48 KB (unzipped) in size and requires .NET framework 4.
it is actually supposed to be called by other programs instead of used standalone.
How does one call it from another program?
Color Tools is also a Photoshop-like color picker. Take a look! http://www.color-tools.com