Computer Graphics Flashcards
Resolution
Number of pixels contained on a display monitor
Formulae for resolution
x*y
Dot pitch
Distance between 2 pixels of the same color
Refresh rate
The number of times a display’s image is repainted or refreshed per second. It is represented in hertz.
Dot frequency
It represents the number of pixels transmitted or displayed per second.
Dot frequency formulae
size of desktop * refresh rate
Aspect ratio
Ratio of width to height
Size of screen
Diagonal of the display
Color Dept
Refers to the number of bits per pixel on a computer monitor to represent a specific color. (how many color values can be created.)
Direct Pixel representation
Each pixel stores the value required for memory and color values.
Palette based Pixel Representation
Is a palette that contains values corresponding to colors. The pixel will contain the index number for the pixel color corresponding to the palette.
Features of pixel direct represenation
- Higher memory
- Used for detailed images
Features of palette based representation
- Lower memory
- Cannot be used for detailed images
Vector Graphics
All the information is represented by mathematical formulae
Examples of Vector Graphics
- Polygon based drawings
- Line based drawings
- Circle based drawings
Features of Vectors
- Used for logos, fonts etc…
- Scaling in size can be made without harming the quality of graphic
- resolution independant
Drawbacks of Vectors
- Cannot display detailed images
- No photographic images
Raster Graphics
Graphics are bitmaps that use parameters to create the image.
Examples of raster
- Non-line art images
- Digitalized photographs
- Scanned Artworks
- Detailed graphics
Features of raster
- Quality is based on size
- Used for high quality graphics
- Resolution dependent
