Why do we use CMYK instead of RGB? (Very colorful post)

Hi,
maybe you too wondered why there is written CMYK on printers. If you have printer or you found out what it means you too know that it is abbreviation for: Cyan, Magenta, Yellow (and K which I will tell later).

What CMY stands for?

 

 


Those are the colors that you have to fill inside the machine to print you stuff. Sure this is ok, but why do not we use RGB (red, green, blue)? It seems to be used everywhere so why not in printers?

I thought this because I was thinking that from RGB you can get any color, and sure you can, but only in additive process. Such a process happens for example with light, white light is made up of many different parts with different wavelengths that ADD up. So what does mean that something is red(?), well it reflects only red light absorbing the rest. If you put there blue the material will be even more darker because it will reflect only the combination of blue and red. If you combine everything it would not reflect at all, the object would be black.

This is an example of substractive process with colors. You can see that RGB is darker since you will get it by substracting CMY.

So what you want to do is to start with lighter colors, those are cyan, magenta and yellow. They too are able to add up to all other colors + lighter than RGB in this subtractive form. Even then colors are not perfect in printers so you can not add up to some, bright red, blue  and green wont be displayed very well.

 

 

 

 

 

 

What the “K” stands for? It stands for “Key” which is the color black (it is the KEY thing). While CMY can add up to black, it would not be very pure since the colors can not be clean, it was decided that there will be black added because in most texts black is used. The letter “K” was used because “B” was already used in the RGB model.

Dragallur

PS: check out these two links about colors shared by Jim Ruebush, they are truly amazing:
1) 2)

 

Versatile blogger award

Hi,
It seems that I have been nominated after very long time for an award. This time it was by Abhijit from “informaticcoolstuff“, thanks for nominating me, as I said, it did not happen in long time so I am glad that I have got it now!


 

RULES:

1.  Display Award

2.  Thank the person who nominated you

3.  Share seven facts about yourself

4.  Nominate up to 15 other bloggers-

SEVEN FACTS ABOUT ME:

Seventeen is my favorite number and it is part of tripolis sequence.

My favorite colour is green and I think that everybody should have some gadget to measure colors according to RGB so we would not need to argue about it, especially with girls.

This is what I mean

My most favorite popular astronomer is Phil Plait

I listen to metal and epic music, that means Insomnium and Two Steps From Hell

I live in the town that has the largest pond in central Europe.

I play frisbee, that is the cool sport with flying disc.

Black holes were roughly the first topic in astronomy that I really was interested in.

MY NOMINATIONS:

Abyssbrain, right now it seems that he is having some problems with his page so I will link it later.

Joseph from Rationalising The Universe

BODHI

Through Ivy`s Eyes

Matilda’s Lab

Deanne’s World

Hop on a Comet

mathsbyagirl

The Traveling Space Opera

Fatherhood, Fails, and Football

Eustat

Matthew Wright

Blair (The Shameful Sheep)

Poemsandpoemes

Gabriel Tonello

As Abhijit said in his nomination, I would pick even more though the rules are 15 bloggers.

Thanks again!

Dragallur