IMO the palette part should be replaced with a color wheel with addition of rgb/hsv sliders, like in software such as Paint.NET. It would make it much better IMO as I feel the image editor is halfway stuck in the Win3.1 Klik'n'Play past (and there's some hints of AMOS graphics editor in there too which is not surprising considering history of the developers of Klik'n'Play). There is an advanced color selector if you double click the color, but using it is cumbersome compared to how it could be if the palette would be replaced by a color wheel.