Renk Uzayı - CMYK - Baskı İşlerinde Kullanılır

Giriş
CMYK renk uzayı aslında çok eskiden beri biliniyor. Açıklaması şöyle.

In 1906, the Eagle Printing Ink Company incorporated the four-colour wet process inks for the first time. These four colours were cyan, magenta, yellow, and black (also known as key), hence the name CMYK. It was discovered that these four colours can be combined to produce an almost unlimited number of richer, darker tones.

CMYK baskı işlerinde kullanılır. Günümüz teknolojisiyle bile ekranda görülen tüm renkleri baskıda görmek mümkün değildir. RGB ve CMYK arasındaki çevrimden dolayı oluşabilecek renk kayıplarından kaçınmak için CMYK ile çalışmak gerekir.

Beyaz Renk

Açıklaması şöyle. Beyaz rengi basmaya gerek yok.

Everything that is white in a CMYK image is non-printing, because white ink is not used in that printing process.

Soru şöyle. Bu soruda CMYK subtractive model, RGB ise additive model olarak anılıyor

Why is CMYK more efficient/beneficial than RGB for performing printing on paper?

Bence en anlamlı açıklama şöyle. Yani ekranda farklı renkleri elde etmek için farklı renkleri eklemek gerekiyor. Her şeyi eklersek beyaz elde ederiz. Kağıtta ise beyazdan başlıyoruz. Bir rengi elde etmek için diğer renkleri çıkarmak gerekiyor.

CMY vs. RGB is basically a question of how printing on paper works compared to how (for example) a monitor works.

Something like a monitor uses an additive model. You start with three tiny light sources next to each other, each emitting some amount of a component color. These are then basically added together to produce a result of a single apparent color.

When you're looking at something on paper, however, you start with the ambient light falling on the paper. Thanks to how our eyes adjust to ambient light, we usually see this is pretty much "white" regardless of its color1.

The ink we deposit on the paper then subtracts the colors we don't want. To see something as a particular color, we filter out the appropriate amounts to get from white to that color. To get Red, we have to filter out Green and Blue. To get Blue, we filter out Green and Red. And to get red, we have to filter out green and blue.