Anyway, here it is for all of you to enjoy. Hopefully useful when you don't feel like opening up Photoshop to get a CSS color.
I'd love to hear suggestions for how I can improve it. (Sorry that the bubbles next to Lab are missing; refreshing the square on the left was too slow for it to be useful.)
Long ago I needed color picker, so I did research many options. This was the most efficient implementation I found (the trick I described above comes from here):
It would also be cool if multiple copies of the tool could dynamically be added to pick multiple colours at a time - with, say, up to eight blocks at the top showing the current colour for each selector, and a text box to easily copy the various colours...
Thanks for sharing - this is nice!
Instead of using images, the square and slider markers could be drawed on an extra canvas on top.
Just imagine the hassle you have to go through if you want to change a programmatically rendered sprite as opposed to opening it in an image editor and simply changing it there.