Visual Communication

Topics: World Wide Web, Web browser, Web page Pages: 12 (2718 words) Published: April 3, 2013
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 full-time staff, and the public work together to develop Web standards * How web pages work

* Web pages are files stored on computers
* A Web page is a simple text file that contains not only text, but also a set of HTML tags that describe how the text should be formatted when a browser displays it on the screen. The tags are simple instructions that tell the Web browser how the page should look when it is displayed. The tags tell the browser to do things like change the font size or color, or arrange things in columns. The Web browser interprets these tags to decide how to format the text onto the screen. * It searches and finds information on web servers, retrieves the information and brings it back to you, and renders the information for display on your computer or mobile device * Local vs. cloud computing

* Local: local files are stored on a computer’s hard drive * Cloud: Cloud computing is the use of computing resources (hardware and software) that are delivered as a service over a network (typically the Internet). * CMS (content management system): a computer program that allows publishing, editing and modifying content as well as maintenance from a central interface. Such systems of content management provide procedures to manage workflow in a collaborative environment. * HTML and CSS

* HTML (hypertext markup language): the content on a webpage- browser reads the HTML document and composes them into web pages. Divs are divisions; separate our content into sections. * HTML brackets always look like this <>, tags are instructions for the browser * CSS (cascading style sheets): how to the content is formatted (color, fonts, etc.) * CSS made up of rules that tell the browser how to display content * Curly braces contain declaration {}

* Each property is followed by a colon
* The value of a property is followed by a semi colon * Originally, HTML...
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