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Computer Graphics

Chapter 6 [06-11-12]
by

Mariza A

on 18 June 2013

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Transcript of Computer Graphics

Computer Graphics
Vector and Bit-mapped
Vector
- graphic images represented in a series of series of mathematical shapes

- properties allows, as on a computer display screen, to be rotated or proportionally scaled.
Bit-mapped
- graphic images that are formed by a collection of bits

- consists of a matrix of individual dots (pixels) which all have their own color

- color depth/bit depth is the number of bits used to indicate the color of a single pixel in a bitmapped image
Paint.net
- alternative to Photoshop if only aiming for a quick image retouch.
- supports layers, history, and has an action manager
- cannot open non-BMP supported files (not including JPEG, PNG, GIF, TIFF, etc.)
GIMP [GNU Image Manipulation Program]
- upgrades make it comparable to Photoshop, without a hefty price, or any price at all.
- includes filters, layers and masks, dynamic brushes, and a 32-bit color support.
- photo retouching, image composition, and image authoring
Inkscape
- open source
- import formats such as JPEG, PNG, TIFF
- exports PNG as well as multiple vector-based formats
- features include paths, markers, clones, alpha blending, transforms, gradients, patterns, and grouping.
PROS
- good for reproducing 'continuous tone images (photographs)

- amount of detail depends on resolution (Dots Per Inch, Pixels Per Inch)

- pixels can be modified individually or in large groups (by alternating a palette)
CONS
- individual pixels become visible when an image is enlarged

- the higher the resolution and the more colors, the larger the file size + the less efficient the compression process will be

- data compression can shrink the size of pixel data

- shrinking throws away pixels instead of conserving them, changing the quality of the image
PROS
- useful for storing images composed of line-based elements/geometrical objects

- a small file size and the ability to scale the image to any size, without the loss of quality

- sophisticated formats store 3D objects (polyhedrons and wire-frame models)

- easily converts to other vector formats
CONS
- can't reproduce 'continuous tone' photographic images like bitmaps. Some photographs aren't stored as easily.

- the quality of the appearance of vector images depends on the application interpreting the image.

- because of their incapability of producing photographic images, they usually resemble sharply drawn cartoon images
Video Card
"The video card is an expansion card that allows the computer to send graphical information to a video display device such as a monitor or projector."
http://pcsupport.about.com/od/componentprofiles/p/p_video.htm
Two pieces of hardware which restricts how well images can be displayed
"...a graphics processing unit is a single-chip processor that creates lighting effects and transforms objects every time a 3D scene is redrawn."
Graphics Processing Unit
http://www.webopedia.com/TERM/G/GPU.html
The two main graphic classifications are....
[example: pixels of 8 bits and fewer can represent either gray-scale or indexed color]
Basically the two different interpretations of an image are...
Full transcript