PIXEL

Pixel:

Smallest portion of an image or display. 

Basic logical unit in digital graphics.   

Invention:
In 1950's. 

          
Derived from:

Picture Element (PEL).

Measured in:

PPI (Pixel Per Inch).

                       

Pixel made of:

Triads which determine the native resolution.

Triad:

Group of three phosphor dots colored Red, Green, Blue.

                   

                       

Pixel combines to form:

Complete image.

Video.

Text on computer displays.

Functional diagram of pixel:

       

Purpose:

Sensor elements of digital cameras or number of display elements in image.

What is a pixel used for:
Stores color information of image like Red, Green, Blue (RGB) or Cyan, Magenta, Yellow, Black (CMYK).

How information is stored:
As bits.

Meaning of pixel in camera:

Pixel, pel, dots is physical point in image.

Intensity of each pixel is variable.

Mega pixel:

One million pixels.

Resolution of cameras is measured in megapixels.

Better to have more megapixels or not:

Larger pixels more light can collect.

More light it catch its the better image.

Do pixels need in our phone:

Yes, even a tiny picture can pack lot of good quality information to improve photo quality but not pixels.

How do pixels work in digital camera:

Made up of tiny photosites.

Photosites are called pixel.

Contraction of picture element.

Million of pixels in camera.

Photosite:

Million of tiny cavities to record an image.

Examples in daily life:
Cameras to take selfies electric signal hits CCD breaks in to million pixels color of each pixel stores it as a number.
Used in older computers.

                    
Video games.

Applications:

Computers.
Camera sensors.
Photo browsers.
Mobile phones.