Instructions are pretty simple, but there are few things you should know. 1. The fill option glitches a lot. 2. You can only save your image by right-clicking and then clicking save as. 3. Please mention any other glitches you notice. 4. A new version will be created soon. 5. This is an old project that I thought to sharing, (i did make a few tweaks for it though)
Most was by me. HSV to RGB code from scratch wiki. * press space and see what happens