The specific color that a pixel describes is some blend of three components of Larger than the physical size of the screen's dot (that is, a pixel will use more The resolution to something less than the maximum resolution, a pixel will be Pitch (let's just call it the dot size) of the display. Resolution, the physical size of a pixel will equal the physical size of the dot Set the resolution for the display screen. The physical size of a pixel depends on how you've Typically, an image is created using vector graphics and then, when the artist is satisifed with the image, it is converted to (or saved as) a raster graphic file or bit map.Ī pixel (a word invented from "picture element") is the basic unit of programmableĬolor on a computer display or in a computer image. A vector graphics graphic image, however, is designed to be quickly rescaled. Thus, an image with much solid color will tend to require a small bit map.īecause a bit map uses a fixed or raster graphics method of specifying an image, the image cannot be immediately rescaled by a user without losing definition. It only needs to contain information indicating a new color as the display scans along a row.
Raster graphic file format software#
A raster file is usually difficult to modify without loss of information, although there are software tools that can convert a raster file into a vector file for refinement and changes.Ī bit map does not need to contain a bit of color-coded information for each pixel on every row. The raster file is sometimes referred to as a bitmap because it contains information that is directly mapped to the display grid.Ī raster file is usually larger than a vector graphics image file. (And for three-dimensional images, a z coordinate.) A raster image file identifies which of these coordinates to illuminate in monochrome or color values.
A raster is a grid of x and y coordinates on a display space.
Raster graphics are digital images created or captured (for example, by scanner in a photo) as a set of samples of a given space. Introduction to graphic file formats and conversion Raster file formats
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