There are two different types of file formats – bitmap and vector drawing. Bitmaps is the most basic of the formats with each image made up of individual pixels. This format is most often used with photographs and images that contain subtle shading.
There is however one problem with bitmap images, scaling up the image. This is because by scaling up the individual pixels become more pronounced, leading to a jagged appearance. There is the ability to improve this using a technique called anti-alias which acts to smooth the graphic, however this still will result in a jagged appearance as the image is scaled up once more. This again can be improved through increasing the image resolution, however this causes the problem of making the file larger and therefore slower to load.
Programs that produce such files are Adobe Photoshop, Paint Shop Pro and Corel Photo Paint, with file formats including BMP, GIF , JPEG, JPG, PNG, PICT (Macintosh), PCX, TIFF and PSD. The most popular out of these formats for web pages are Gif and JPEG, the former because of it ability to compress files and therefore speed up loading time, the JPEG because it allows a full range of...
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