RGB

RGB:

Red Green Blue.

                                             

RGB

History:
Developed by Thomas Young, Hermann Helm Holtz and James Maxwell in 1860.

What is RGB?

Representing the colors used on a computer display.
Additive color model in which RGB are added together to produce a broad array of colors.
Device dependent.

Device dependent:

It means colors displayed on the screen depends on hardware used to display it.

Representation of colors:

Range of decimal numbers from 0 to 255.

Equivalent to range of binary numbers from 00000000 to 11111111 (or) 00 to FF.

Purpose:

Sensing, Representation, and display of images in electronic systems such as Televisions and Computers.

                            

How does RGB works?

It is an additive color system.

Combination of red and green appears to be yellow.

Blue and green appears to be cyan.

Red and blue appears to be magenta. 

All three combinations appears to be white.

How do we use RGB?

Onscreen applications such as graphic design.

When and why RGB is used?

Preparing graphics mainly for viewing on computer displays because it can display million more colors than what can be achieved with printing.

Why RGB is not used in printing:
RGB is formed with light but CMYK opposes light.

What is CMYK?

CMYK refers to Cyan (aqua), Magenta (pink), Yellow and Key (black).

CMYK

                            

When and why CMYK is used?

Creating illustrations for print media. Digital printer has came a long way to print in RGB as well.

How Cyan, Magenta, Yellow and black are formed:
Cyan : Red = 0, Blue and green = 255.
Magenta : Blue and Red = 255, Green = 0.
Yellow : Blue = 0, Red and Green = 255.
Black : Red, Blue and Green = 0.

Advantages:

Useful for full color editing because wide range of colors.

Microsoft office.

Applications in daily life:

Blue light photo theraphy is the process to recognize jaundice in hospitals for the baby and fluoroscent light is absorbed by baby skin.
Used in conventional photography.