Multimedia Option Flashcards
Contrast vector and bitmapped graphics
“Vector graphics are created using mathematical formula and are scalable. Bitmapps are created using pixels”
Explain how vector images are stored
“Vector images are stored using mathematical equations (co-ordinates). This means that when they are resized”
Explain how bitmapped images are stored.
Bitmapped graphics are stored by storing individual pixels (dots) which make up an image._Ä©
Give examples of where bitmapped images would be best used?
Photographs!_Ä©
Explain how resolution affects an image.
“Resolution is essentially an images QUALITY. Resolution is the number of pixels in an image”
Define Bit depth
Bit depth is the number of bits required to represent each pixel. We know that: 2^bit depth = number of colours. Also known as colour depth._Ä©
Define colour depth
Colour depth is the number of bits required to represent each pixel. We know that: 2^bit depth = number of colours. Also known as bit depth._Ä©
How do you calculate the file size of an image?
Resolution * Bit depth /8 * 1024
Describe features of TIFF Files
widely supported bitmap format, good with photographic as well as line art graphics (kind of the best of both worlds between jpeg and gif. Can be compressed a little, but not too much. generally about 10 x the file size of the equivalent sized jpeg.
Describe features of BMP Fiels
Uncompressed, good quality files. Generally just used in windows systems.
Describe features of PCX/PICT Files
An older format, that used to be the standard for graphic design. this has been surpassed by other, more standardised file formats.
Describe features of JPEG files
Lossy compression, averages out values of colours near each other to create common areas of colours. Good for photos. Standardised. Does not support transparency, or animation.
Describe features of GIF files
Good for fine line drawings, cartoons, maps, etc. Bitmapped format, but good compression, as uses lossless compression, where quality is restored on extraction. Gif is an 8 bit file format (256 colours) which supports transparency and animation.
Describe features of PNG Files
Good for fine line drawings, cartoons, maps, etc. Bitmapped format, but good compression, as uses lossless compression, where quality is restored on extraction.
Define anti-aliasing
Anti-ailiasing gives the illusion of a higher quality as it may smoothen edges of an image. However anti aliasing takes more to process (graphics card has to do more work) and may worsen the quality (as it is blurrier) on projects that are intended for printed.
Describe features of WMA
WMA files are Windows Media Audio files as these files are optimised for the windows operating system, which may be a negative when a user wants to use it on an apple system (as they need a different codec/program). These files have a low compression and therefore have a higher quality and file size when compared to files such as .mp4.