Pallet might be a little easier to build rather than starting from the top, i guess.
You get artifacts interior the image from using a lossy compression format like JPEG. you could shrink artifacts via using a decrease compression ratio. you additionally can use yet another image format (reckoning on your application). as an occasion, that 2nd hyperlink which has few colorations and straightforward shapes might probable compress fairly nicely as a PNG record fairly of a JPEG, that's ultimate for fairly complicated photos. save a replica of the unique stored as a pspimage and play with distinctive formats and stuff to locate the ultimate effect.
I don't use the program myself but I am fairly sure you click on (in the program) Windows > Toolbars and make sure it is clicked if not, Windows > Colour Pallet. If that doesn't work either try View > Toolbars > Colour Pallet. Might not be called Colour pallet but should be in some of those.
Click on 'View' - 'Palettes' - 'Materials' and then it will appear. Hope this helps =)
say 2 ur p.c 'give me the paint pallet'!!