Rasterikuvaaineistoa

Rasterikuvaaineistoa refers to raster or bitmap image data. This type of digital image is composed of a grid of pixels, where each pixel has a specific color value. Unlike vector graphics, which are defined by mathematical equations and can be scaled infinitely without loss of quality, raster images are resolution-dependent. This means that when a raster image is enlarged beyond its original size, the pixels become visible, leading to a blocky or blurry appearance.

Common file formats for raster images include JPEG, PNG, GIF, and BMP. Each format has its own characteristics regarding compression, color depth, and transparency support. JPEGs are widely used for photographs due to their efficient lossy compression, which reduces file size by discarding some image data. PNGs are favored for graphics that require transparency or lossless compression, such as logos and web graphics. GIFs are often used for simple animations and images with a limited color palette.

Raster images are created and edited using software like Adobe Photoshop, GIMP, and Paint. They are the standard for digital photography and are commonly found on the web and in many digital applications. The quality of a raster image is determined by its resolution, measured in pixels per inch (PPI) or dots per inch (DPI), and its color depth, which dictates the number of colors that can be represented.