DIG 2000 Lecture Notes - Lecture 5: Lossless Compression, Vector Graphics, Image Compression
Document Summary
Computer graphics- technology that allows us to include visuals in multimedia. Software library tells graphic card what to show. Rendering- computer makes the mathematical computation to create something. Bitmap- image is modeled by array of pixel values o o o o. Large file, must store data for all pixels. Records a value for every pixel, recorded from another source. Vector- images stored as mathematical functions o. Small files, easy to store and share: deal with shapes, lines, and curves o o. Compact, scaleable, resolution-independent**: open and closed shapes. Rasterizing- can take a bitmap image and turn it into a vector image. Mask- protects an area of the screen as if its masked by something. Stroke- highlight the path between 2 points (outline) Bezier curve- smooth curve specified by 4 control points. 3d vector graphics- put in imaginary 3rd z axis to give depth, perspective, and allow us to trick ourselves. Possible to decompress and retrieve original file on another machine.
