Image Manipulation

Digital Images

Image Manipulation

Image Manipulation means applying image editing techniques to photographs, thus creating an illusion or deception of some kind.

Can you think of examples where image manipulation is used?

File Types Eps : (Encapsulated Poscript)An image format – compatible with postscript images (stores image as well as font information)

Jpeg / jpg: (Joint Photographic Experts Group)A compressed file type (best for compressing photographic content). Cross Platform

Key Terms

Pixel: The smallest point of an image. Monitors/display screens are divided into thousands of pixels that are arranged in rows and columns. They are arranged so close together.

Image Resolution. Refers to the number of pixels in the image. Describes the detail an image holds. The higher the resolution number the higher quality the image will be.

File Types

Gif: (Graphics Interchange Format)

Limited colour storage – 256 colours. Uses LZW compression

Often used on the world wide web

Tiff: (tagged image file format)

Popular in publishing industry. Best choice for high resolution printing of images but not necessarily compatible with all applications.

File Types

Bitmap:

A type of graphic, not necessarily a photo. Has a fixed resolution (resizing is difficult). Often used for logos.