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Resolution defines the clarity of an image when it is displayed. Resolution is the density of the dots that make up the image. Resolution is expressed in dots per inch (dpi) or, in picture editing software, in pixels per inch (ppi). The higher the resolution, or dpi, of a captured image document, the higher the display quality.
High resolution combined with low compression results in the best quality image, but also the largest file size. For uncompressed images, file size is proportional to image resolution. For example, the file size for an image with a resolution of 200 dpi is four times greater than the file size for an image of the same size and a resolution of 100 dpi. After compression, the 200 dpi file is still larger than the 100 dpi file, but not proportionally so, because of advantageous compression algorithms.
Optimal combinations of resolution and compression depend on what images may be used for. For example, if image documents are exclusively for screen display, with no OCR and little printing, resolution need not be any greater than the display resolution of the monitor, typically 75 dpi to 100 dpi. On the other hand, images that are to be faxed should conform to the international fax standard of 200 dpi. For printing and OCR, while 200 dpi can accomplish the task 300 dpi will offer better results.