Digital image processing techniques are typically classified into three categories. These categories include image generation, enhancement, and restoration. Generation techniques help project and recognize a scanned image, while the process of enhancing an image involves improving contrast, brightness and hue.

Common Image File Formats

• TIFF (. tif, . tiff)
• GIF (. gif) GIF or Graphics Interchange Format files are widely used for web graphics, because they are limited to only 256 colors, can allow for transparency, and can be animated.
• PNG (. png)
• EPS (. eps)
• RAW Image Files (. raw, .

The images types we will consider are: 1) binary, 2) gray-scale, 3) color, and 4) multispectral.

• Binary images. Binary images are the simplest type of images and can take on two values, typically black and white, or 0 and 1.
• Gray-scale images.
• Color images.
• Multispectral images.

1) An image 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. The GIF uses the 2D raster data type and is encoded in binary.

There are 2 main methods of filing, which are Loose Leaf method and secondly, the Collective method. Documents are filed individually in a normal file, holes are punched in the documents and then they are filed.

The files can be arranged on any one or more of the following basis.

• Alphabetical classification.
• Numerical classification.
• Geographical classification.
• Subject-wise classification.
• Chronological classification.