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Basics of Images
An image is a visual representation of any object. The term ‘image’ means a picture that has been created or
stored in electronic form. It can be described in terms of vector graphics or raster graphics. An image comprises
of a rectangular array of dots known as pixel. The size of the image is specified as width × height, in the number
of pixels.
How are images stored
on a computer?
How are images
displayed on a screen? What are the
components that make
up an image?
Basics of Pixels
Pixel stands for "Picture Element". It is the smallest unit of information in a digital image. These pixels are arranged
in a 2-dimensional grid to form a complete image, video, text, or any visible thing on a digital platform. A pixel can
have only one colour at a time. Colour of a pixel is determined by the number of bits it represents. The more pixels
you have, the more closely the image resembles the original.
In the image below, a specific section has been zoomed in multiple times to reveal its structure in individual
pixel. Each pixel represents a small part of the image, and together, they combine to form the entire picture. As
you examine the zoomed-in portion, you can observe how the arrangement of pixels approximates the original
image. The higher the number of pixels in the image, the more detailed and closer it will appear to the actual
representation.
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