Image
In
common usage, an image or picture is an artifact, usually two-dimensional, that
has a similar appearance to some subject—usually a physical object or a person.
Images may be two-dimensional, such as a photograph, screen display, and as
well as a three-dimensional, such as a statue. They may be captured by optical
devices—such as cameras, mirrors, lenses, telescopes, microscopes, etc. and
natural objects and phenomena, such as the human eye or water surfaces.
Digital
Image
A
digital image is a representation of a two-dimensional image using ones and
zeros (binary). Depending on whether or not the image resolution is fixed, it
may be of vector or raster type. Without qualifications, the term "digital
image" usually refers to raster images.
Pixel
In
digital imaging, a pixel is the smallest piece of information in an image.[6]
Pixels are normally arranged in a regular 2-dimensional grid, and are often
represented using dots or squares. Each pixel is a sample of an original image,
where more samples typically provide a more accurate representation of the
original. The intensity of each pixel is variable; in color systems, each pixel
has typically three or four components such as red, green, and blue, or cyan,
magenta, yellow, and black.
Raster
Raster
images have a finite set of digital values, called picture elements or pixels.
The digital image contains a fixed number of rows and columns of pixels. Pixels
are the smallest individual element in an image, holding quantized values that
represent the brightness of a given color at any specific point.
Typically,
the pixels are stored in computer memory as a raster image or raster map, a two-dimensional
array of small integers. These values are often transmitted or stored in a
compressed form.
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