@InspectorCaracal http://colorpalette.imageonline.co/ lets you pick between 2 and 20 colours
https://www.canva.com/colors/color-palette-generator/ extracts 5
http://colormind.io/image/# also 5, with different colours on different runs
http://www.colorfavs.com/palettes/175511/ also 5
https://labs.tineye.com/color/ variable number of colours
@InspectorCaracal ...and https://spin.atomicobject.com/2016/12/07/pixels-and-palettes-extracting-color-palettes-from-images/ might be interesting if you want to roll your own. :D
@Anke you are excellent thank you!!
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