Main colors vs picked colors
The palette shows the most common color groups in the whole image and what share each covers — useful for building a color scheme from a photo. Clicking the image picks the exact color of that single pixel, like an eyedropper.
Using the colors elsewhere
Every color is shown with a code you can copy. Paste it into the color converter to get RGB, HSL or CMYK, or check two of them together in the contrast checker.