2.0 LITERATURE REVIEW
An image may be defined as a rectangular array of pixels. The pixel of a grayscale image is a nonnegative integer interpreted as the intensity (brightness, luminosity) of the image (Deever and Hemami, 2003). It is a picture that has been created or copied and stored in electronic form. An image can be described in terms of vector graphics or raster graphics . An image stored in raster form is sometimes called a bitmap (Margaret, What is image? - Definition from WhatIs.com:, 2005) According to Magaret Rouse, Raster graphics are digital images created or captured (for example, by scanning in a photo) as a set of samples of a given space. A raster is a grid of x and y coordinates on a display space (And for three-dimensional images, a z coordinate.) A raster image file identifies which of these coordinates to illuminate in monochrome or color values. The raster file is sometimes referred to as a bitmap because it contains information that is directly mapped to the display grid. Examples of raster image file types are: BMP, TIFF, GIF, and JPEG files (Margaret, What is raster graphics? - Definition from WhatIs.com, 2005) Vector graphics is the creation of digital images through a sequence of commands or mathematical statements that place lines and shapes in a given two-dimensional or three-dimensional space. In physics, a vector is a representation of both a quantity and a direction at the same time. In vector graphics, the file that results from a graphic artist's work is created and saved as a sequence of vector statements. For example, instead of containing a bit in the file for each bit of a line drawing, a vector graphic file describes a series of points to be connected. One result is a much smaller file (Magaret, 2006) Digital images are characterized by multiple parameters. The first feature of a digital image is its color mode. A digital image can have one of three modes: binary, grayscale or color. A binary (bilevel) image is an image in which only two possible values for each pixel. A grayscale image means that its each pixel can contain only a tint of gray color. A digital image is a set of pixels. Each pixel has a value that defines color of the pixel. All the pixels are composed into one array (Rapinder and Kaushal, 2010) 3.2.1 Images Formats
There are various formats of images ranging from TIF, JPG, PNG, GIF (which are the most common ones known and used on internet websites), though there are many others, yet these are just few of the most popular images format used today. 18.104.22.168
Joint Photographic Expert Group (JPEG)
JPG (JOINT PHOTOGRAPHIC EXPERT GROUP) FORMAT is mostly used on digital cameras and webpages because of its historical data compression rate which is very high. However JPG uses lossy compression method which allows for compression to a very low size but with reduced image quality. JPG file format makes image more available on portable devices because the processing rate of images in this format is considerably minimal. Also due to its reduced size characteristics, it tends to make image transfer more convenient and time saving (Wayne, 2010). 22.214.171.124
Tagged Image (File) Format (TIFF)
TIF is lossless (including LZW compression option), which is considered the highest quality format for commercial work. The TIF format is not necessarily any "higher quality" per se (the image pixels are what they are), and most formats other than JPG are lossless too. This simply means there are no additional losses or JPG artifacts to degrade and detract from the original. And TIF is the most versatile, except that web pages don't show TIF files. For other purposes however, TIF does most of anything you might want, from 1-bit to 48-bit color, RGB, CMYK, LAB, or Indexed color (Wayne, 2010).
TIFF was created by Aldus for ‘desktop publishing’, and by 2009 it was transferred to the control of Adobe Systems. TIFF is popular...
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