Light Primary Colors and Displays

Primary Colors

The visible light spectrum is composed of Red Green and Blue light. All the colors we see are the brain's interpretation of the combination of these three colors at different intensities.

Color Combinations

On computers the intensity of each color ranges from 0 to 255. Where 0 means no color and 255 is the maximum intensity. On HTML it is common to see colors specified as rgb(255,56,32) when specifying them as red, green and blue, or as hexadecimal #FF3820. 
 

Displays

Displays are nothing but arrays of RGB diodes used to display images.

Pixel Density

Different screens have different resolutions and sizes and both play a role on this matter because there is an inverse correlation between screen size and pixel density. To get the pixel density you have to divide the amount of pixels by the area of the screen.