Visual Communication
Vis Com Study Guide Exam II
* Vector vs. raster: * Vector: Vector graphics is the use of geometrical primitives such as points, lines, curves, and shapes or polygon(s), which are all based on mathematical expressions, to represent images in computer graphics. (more than a straight line) * Raster: image, or bitmap, is a dot matrix data structure representing a generally rectangular grid of pixels, or points of color, viewable via a monitor, paper, or other display medium. * File formats: * PSD: Photoshop document- native file format * TIFF: preserves layers and is cross platforms * GIF: compressed, cross platforms, supports transparency, good for flat graphics such as logos (256 colors) * JPEG: compressed, small file, lossy (compresses data by losing some of it) * File size and resolution: * No way to convert a low-resolution image to a high one; * A larger image not only takes up more hard-drive space, but it will also show up larger on your monitor and when you print it out. For example, a 5-megapixel image contains more horizontal and vertical pixels than a 3-megapixel image, so it will take up more space on your monitor when viewed at its full size. * Traditional print media: 226-300ppi * Web 27 ppi * Bytes not dimensions * Keep images for web under 100kb each * Save for web * Indexed color: technique to manage digital images' colors in a limited fashion, in order to save computer memory and file storage, while speeding up display refresh and file transfers. It is a form of vector quantization compression. * Ex. RGB * Max of 250 colors, 8 bit graphic * How web browsers work * Web: network of computers around the world * A browser is software that reads web files and displays them * Not all are created equal * W3C: World Wide Web Consortium (W3C) is an international community where Member organizations, a
* Vector vs. raster: * Vector: Vector graphics is the use of geometrical primitives such as points, lines, curves, and shapes or polygon(s), which are all based on mathematical expressions, to represent images in computer graphics. (more than a straight line) * Raster: image, or bitmap, is a dot matrix data structure representing a generally rectangular grid of pixels, or points of color, viewable via a monitor, paper, or other display medium. * File formats: * PSD: Photoshop document- native file format * TIFF: preserves layers and is cross platforms * GIF: compressed, cross platforms, supports transparency, good for flat graphics such as logos (256 colors) * JPEG: compressed, small file, lossy (compresses data by losing some of it) * File size and resolution: * No way to convert a low-resolution image to a high one; * A larger image not only takes up more hard-drive space, but it will also show up larger on your monitor and when you print it out. For example, a 5-megapixel image contains more horizontal and vertical pixels than a 3-megapixel image, so it will take up more space on your monitor when viewed at its full size. * Traditional print media: 226-300ppi * Web 27 ppi * Bytes not dimensions * Keep images for web under 100kb each * Save for web * Indexed color: technique to manage digital images' colors in a limited fashion, in order to save computer memory and file storage, while speeding up display refresh and file transfers. It is a form of vector quantization compression. * Ex. RGB * Max of 250 colors, 8 bit graphic * How web browsers work * Web: network of computers around the world * A browser is software that reads web files and displays them * Not all are created equal * W3C: World Wide Web Consortium (W3C) is an international community where Member organizations, a