In addition, the artefacts will affect the analysis algorithms that are used in our analysis software to detect features of the image automatically. JPG format should only be used for publishing images for display, in web pages for instance. Image compression is a method by which an image can be stored on your computer using less disk space. This can be useful if you have a lot of images or if you are going to send the images over a network or the internet. There are many methods of compressing images.
Compression is made possible by storing codes that identify blank or repeated parts of the image.
An image can usually reduce to around half its size using these methods. Compression usually involves devising formulae which represent the overall structure of the data with some of the finer detail missed out. Images can be radically reduced by these methods maybe to under a tenth their original size. There are two places where compression may occur in images. Internally compressed - where the format of the image file allows the image data to be compressed within the file.