If you find any interesting image online which has a great color combination and you want to use it in your theme, but then you will need a software or a color picker installed to get the color from the image. ColourGrab is a free online service which can provide you with the most used colors in any image hosted online. You need to type a URL of any online image below and the system will tell you the most used colors from that image.
The image should be hosted online and the service does not offer to upload the image from your local folder. Once it analyses the service provides you with the most used color codes in the image.
The application also provides you with the download link for Adobe® Switch for the color scheme for developers. ColourGrab is a simple yet useful service to quickly get the color code from any image.