Colours and hexadecimals
Thursday, February 5, 2009 // 2:24 PM
"You've got to do your own growing, no matter how tall your grandfather was." - Irish Proverb
Today in class we learned about colour wheels. CYMK (cyan, yellow, magenta and key ->black)which is what we use for ink (e.g. art class) and RGB (red green blue) is light-focused (e.g. computers).
- There are 256 picture elements (pixels) in each colour
- every pixel has pieces of rgb (red green blue)
- to get "perfect" colour (e.g. perfect blue), enter 255 (because 0 is a level) for blue and 0 for the red and green.
- no levels = black
- all levels = white
- even levels = grey (on a scale of black-looking grey to white-looking grey)
- 16.7 million different colours (shades)
- colours on computer are measured in hexadecimals
He also taught us Hexadecimal place values.
BASE 16
e.g. 1, 16, 256, etcetc
Since you can't write 10 in a single place value, we use letters of the alphabet to represent double digit numbers.
A= 10 B= 11 C= 12 D= 13 E= 14 F= 15
THERE IS NO G or the rest.
How do Hexadecimals relate to colours? Well colours use hexadecimals as their language so you know how a code for a certain colour looks like #3fe33f (e.g. on MSN). Well believe it or not, that is hexadecimals!
See you later,
- Serena
Labels: colour, CYMK, Hexadecimal, pixel, RGB, wheel