Now we learned about the colours that are used in photoshop an din real life I'm a little dissapointed because we dindn't get to use the program anyway there are 256 levels of RGB ( one for each colour ) and there are around 16 million colours each with their own code in the hexadecimal system. The hexadecimal system is like binary but goes by 16 ; 1 , 16 , 256 and the computer interprets it by suing numbers until 9 then it goes with letters.