In digital imaging, a pixel (or picture element) is a single point in a raster image. The pixel is the smallest addressable screen element; it is the smallest unit of picture that can be controlled. Each pixel has its own address.
Resoulutions
resoulution is the number of dots/pixels used to display an image, its normally used on a computer screen or on a digital camera.
Raster/Bit-map Images
A raster image, also called a bitmap, is a way to represent digital images. The raster image takes a wide variety of formats, including the familiar .gif, .jpg, and .bmp. A raster image represents an image in a series of bits of information which translate into pixels on the screen. These pixels form points of color which create an overall finished image.
Vector images
Vector graphics is the use of geometrical primitives such as points, lines, curves, and shapes or polygon(not photos), which are all based on mathematical equations, to represent images in computer graphics.
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