Colr.org is one of the best online Color Chooser from images. The operation is a bit tricky. First, click on New Scheme button. Then click on the + sign just below to add your first color to your scheme from the images below. Be sure to click on the + sign again to add another color to your scheme.If you click on the Color Images tab you can Load Your Own images or URL to choose colors from. Be sure to try the other Colr buttons!
ColourLovers PhotoCOPAis a tool to find the key colors within an image or URL page. What is neat is the many way an images color palette can be manipulated in PhotoCOPA. This is another great ColourLovers.com tool.
Color Hunter provides a quick and easy way to derive a color palette from an existing URL or uploaded image. But as in most of the other tools it does not tell how the colors for the palette were selected. However, Color Hunter provides a Hunch dialog that shows variations on the basic palette derived from your image.
CSSDrive has a color palette extractor similar to Color Hunter demoed just above. Again it is easy to provide a local image file or a online URL for an image [right mouse click and then select image URL from the popup menu]. CSSDrive provides a light, medium and dark palette. User can also save their palettes as a .CSS file or a .ACO Photoshop swatch file.
GenoPal Pic2Color provides a nifty widget for grabbing a local image file or URL picture and then showing a palette of colors picked from the widget. Users can copy this widget and embed it on their website if they want.
ColorMunki strictly speaking is a color picker with palettes derived from a wide selection of predetermined pictures. But ColorMunki allows users to create palettes from the Munsell or Pantone color systems in such an effective way it had to be included here.
ColorExplorer provides a rich tool for exploring either URL or local image file colors. The trick is to get your image or Web page linked into Color Explorer - that is why we start on that page. Once your image is in [note it must be less than 250KB in size] there are many tabs worth trying including Color Picker, Color Matching, plus Analysis & Conversion. Enjoy!