Colorium gives the option to pick a color from the screen and get it representation in RGB, HEX and HSV.
Just click on "Pick a colour" button and click on the screen to get the colour.
You can use the Finder extension to pick a colour on the screen. To activate the extension go to System Preferences -> Extension and you will get it on Finder section.
Main features:
- Point and Click interface
- Color picking from the screen
- HSV, RGB and HEX values