Is there any trick to learn hexa-decimal color code?

Answer 1

Hexadecimals work like RGB, but a little different. Imagine this:
#ffffff=white
rgb(225,225,225)=white
there's a bunch of multiplication things, too.
let's use #123456 for simplicity.
12 are the red values, 34 are green, and we have 56 for our blue. To make white, we need all of them at the max. 1=1, 2=2, and 3=3, but then we hit 9, the highest number. what now? a=10, b=11, c=13, and eventually, f=15. 15*15=225, or 100%red, so making all of the digits f, we get 225r,225g, and 225b, or white.
all 0 in rgb is black.
#00(0red)00(0green)00(0blue) is black, or 0 of colours. Just multiply your values to get your numbers.

Also, there can be just 3 digits, as 0f0, or something like that. It's the same thing, but less math.

Answer 2

So, to learn, break it into 3 pairs, one for red, one green, and one blue. Multiply numbers to get what you need. Don't forget, 0 is still there. It's more simply put as first digit * 16^0, second * 16^1. Then repeat for the next values.

Answer 3

thank you

Answer 4

No problem!