Scratch can set RBG values as colours! This turns hexadecimal into RGB and is then drawn on the screen. You can use 0-9 A-F (Or a-f if you want) Questions: Whats Hexadecimal? We use a Base-10 counting system, (0,1,2,3,4,5,6,7,8,9) However, Hexadecimal is Base-16 which is (0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F) so it counts like this: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, (Then it goes) A, B, C, D, E, F, 10, 11, ..., 19, 1A, 1B, ..., 1F, 20)! What's RGB? Your screen is made of pixels. Each pixel has 3* LED lights, Red, Green and Blue. (RGB) They can have any brightness from 0-255 and so if I put in (255,127,0), the colour would be orange because it's 100% red and 50% green. (0% Blue) What does Hexadecimal have to do with RGB? As I said, the LED's have a brightness from 0-255. That's 256 different numbers. (Don't forget to add 0!) Since hexadecimal is base 16 and 16*16=256, If I give 2 letters of hexadecimal, e.g. B5 then I can give a brightness for 1 LED. If I give 6 letters, I can do all 3. Try some examples! FF0000 - Red 00FF00 - Green 0000FF - Blue FFFF00 - Yellow FF00FF - Magenta 00FFFF - Cyan FFFF80 - Sun FF80FF - Pink 80FFFF - Sky FF8000 - Orange FF0080 - Deep pink 80FF00 - Lime 8000FF - Purple 00FF80 - Turquoise 0080FF - Simple Blue 008080 - Cyan 800080 - Dark purple 808000 - Dark yellow FFFFFF - White 000000 - Black 808080 - Grey FF8080 - Light pink 80FF80 - Light Lime 8080FF - Light Blue-Purple 000080 - Navy 008000 - Forest 800000 - Royal red *It's 4 but the last one is green again as humans have adapted to green light and the pattern needs to be a square. r G G b 25% Red 50% Green 25% Blue r G r G G b G b r G r G G b G b
