Image Color Picker reads an image and reports the handful of colours that cover the most of it, each as a hex code with a rough percentage. It is for matching a design to a photo, or lifting a scheme from a screenshot or a competitor's site.
The image is scaled down and analysed on a canvas in the page. It is never uploaded.
No. It is drawn to a canvas and analysed in the open tab. Nothing leaves your device.
A median-cut pass groups every pixel into the number of buckets you asked for and averages each one, weighted by how much of the image it covers.
A different count re-groups every pixel from scratch, so the averages shift. The result for a fixed count is always the same.
It reports the colours that are present. Flat graphics come out clean; photos with gradients produce muddier midtones.