Searched all over, can't find the dang thing, coulda sworn I bookmarked it - I need a link to that site hosting a palette organizing tool. You upload an image and it parses the image and spits out a palette of the images colors, organized by luminosity, etc.
The site is primarily black and has graphics from some outer space pixel art side scroller game as the working example. If you still have a link, please share it. Thanks!