Gpick
Gpick is a color picking application with many useful features. The application has a clean and understandable layout. You don’t need to read many pages to understand how the application works and this is very nice to see for a linux application. The application has three tabs, a color picker, scheme generation, layout preview.
The first two are probably the most interesting ones. Capturing colors is done by pressing the space key. For a more exact color selection the color picker can be used and by using the mouse wheel you can zoom in or out and capture with the space key. The second tab, scheme generation is a useful one too as you can generate color schemes by different generators like complementary, analogous etc. The third one layout preview is for the lazy people to export the layout colors in a css file.
go to the website code.google.com/p/gpick/ or use yaourt gpick and it should do all the hard work for you!
Additionally the application can export your color selections and import them later the only thing which I miss there is that the exported data is a simple text file but the hex,rgb,hsl data is not stored there so you have to use the application to copy each selected color.
here is a short video:
The application starts fast and works. This is one of the applications I will keep as it provides me with a tool for web development that wasn’t available for linux before with the set of features.