Raszterformátumok

Raszterformátumok refer to a group of digital image file formats that store images as a grid of pixels. Each pixel is a tiny dot that contains color information. When viewed together, these pixels create the visual representation of the image. Unlike vector formats, which use mathematical equations to define shapes, raster formats store the image data directly, meaning the image is composed of a fixed number of pixels. This characteristic makes raster images resolution-dependent. Enlarging a raster image beyond its original pixel dimensions will result in a loss of quality, appearing pixelated or blurry.

Common raster formats include JPEG (Joint Photographic Experts Group), PNG (Portable Network Graphics), GIF (Graphics Interchange Format), and BMP (Bitmap). JPEG is widely used for photographs due to its efficient compression, which allows for smaller file sizes by selectively discarding some image data, though this is a lossy compression. PNG is favored for web graphics and images requiring transparency, as it supports lossless compression and alpha channels. GIF is an older format, known for its support of animation and its limited color palette, making it suitable for simple graphics. BMP is a simple, uncompressed format, resulting in larger file sizes but preserving all image data, often used in Windows operating systems. The choice of raster format depends on the intended use of the image, balancing factors like file size, image quality, transparency needs, and animation capabilities.