Compito di informatica in inglese
- 1. The resolution refers to the level of quality of an image. Generally we use this term about digital images, but also to any photograph has a certain resolution. In the images on a computer, the resolution indicates the density of points elementary dot, which form the image compared to a linear dimension. The screen of a computer can not show lines or drawings, but only points, if they are sufficiently small, so as to be smaller than the resolution the human eye, the observer has the impression of seeing lines instead of aligned points, and drawings rather than distinct clusters of dots. The resolution, therefore, being a measure of the density of the image points represented on a support, (paper or monitor) is measured in dots per unit length, where quest'ultimadi is usually the thumb. Images usually occupy much space and to be kept are often compressed. They are composed of PIXEL, which is the smallest unit that a computer can display. The following file types for images and photographs are: - BMP (Bit Mapped) format that defines the position and color for each pixel. Take up much space and can not have animations and even a transparent background; -tif (Tagged Image File) format common in the exchange of bitmap images of different application programs, in particular those using images captured by the scanner; -gif (Graphics Image Format) the most used format for graphic images on the Internet, which has become a de facto standard of the most common, you can also compose a short sequence of images into a single file to get the gif Animated Gif; -jpeg (Join Photographic Experts Group) format based on compression algorithms that must balance the need for high image quality with minimum file size, format is widely used in web pages; -PNG (Portable Network Graphics) image compression format to replace the GIF format with respect to which offers significant improvements and a greater degree of compression, -cdr (Corel Draw) format files created with Corel Draw, one of the most popular graphics programs.