Shrinking a bitmap image (reducing the amount of pixels in it) is easy to do with an image-processing program, but enlarging an image (or increasing the number of pixels) often leads to the quality suffering. a picture of 1600 x 1200 consists of 1600 horizontal and 1200 vertical pixels.Ī bitmap can be shrunk or minimized. The number of pixels is given as the number of horizontal and vertical pixels e.g. The resolution of a bitmap is determined by how many pixels the image consists of the more pixels there are, the higher the resolution and the physically larger a print-out can be made without the quality suffering. See the examples below for how much storage space the different file types require: store photos from a digital camera as gif files, or you may destroy the colouring of the image! The information contained in a bitmap can change if you use the wrong file type, so pay attention when saving images do not e.g. Gif is very good for pictures with large colour fields since it compresses images in a small size without losing any image information. Gif is not suitable for storing photos but well suited for drawings. gif: a file type that can only store 256 colours.png: a file type that is gradually becoming popular on web pages.bmp: commonly used in Windows, but takes up a great deal of storage space.tiff: a file type commonly used by printing houses and professional image processors for its special features.Jpeg is a good choice for saving photos, but if a picture contains many lines or large colour fields, problems with image quality may occur. The advantage with jpegs is that you can adjust the file size, but at a cost when storing an image as a jpeg some of the information is usually lost so the quality of a jpeg deteriorates if it is stored many times. jpeg/jpg: the file type in which most digital cameras store their photos and is commonly used on web pages.Some typical file types for storing bitmaps include: GIMP (works in both Windows and Linux) is an example of a non-commercial program. Photoshop Elements and Paint Shop Pro (Windows programs), while e.g. Some well known, commercial programs are e.g. Since the data in bitmap images is easy to store in different file types, you can watch and modify bitmaps with many different image-processing programs. scanners: an image, spreadsheet or text scanned into electronic format with a scanner will be stored as a bitmap.digital camera: pictures taken with a digital camera are stored as bitmaps.screen capture tool: you can also save an image of the contents of the entire screen or individual windows with a computer or phone.cell phone cameras: modern smartphones are capable of taking high-quality photos.image-processing program: you can create and draw bitmaps with different programs.Here are some methods and hardware with which you can create bitmaps: in printed material, in word processing, online materials and websites. ach pixel has a colour, and the combination of these pixels of different colours together form an image (see the image below and its enlargement).īitmaps are used e.g. Vector graphic images: consist of lines, circles and other mathematical objects.īitmaps are images consisting of several pixels.Bitmap images: contain large amounts of pixels.On the computer, images can be shown either by using pixels or by representing the image as a group of mathematical rules:
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