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Terms in this set (63)
The resolution of a digital still camera is often quoted as the total number of pixels in the largest image it can record.
The pixel density of monitors and still cameras is assumed
The physical size of an image when it is displayed will depend on the pixel density of the device it is to be displayed.
Most image formats record a resolution (pixel density) together with the image data; this is usually the resolution of the device on which it originated.
Scaling an image without changing its resolution changes its pixel dimensions in the same way as changing its resolution without changing its size.
Reducing the pixel dimensions is called
increasing them is called
Images can be losslessly compressed using various methods, including run-length encoding (RLE), Huffman encoding and the dictionary-based LZ77, LZ78, LZW and deflate algorithms.
most commonly used lossy compression method for still images.
use LZW compression and are restricted to 256 colors. One color may be used to designate transparency.
They are most suitable for simple
images with areas of flat color.
developed to supersede GIF.
It uses deflate compression, is not restricted to 256 colors and supports alpha channels for partial transparency.
can be stored in several different formats.
JFIF and SPIFF
compatible formats for JPEG images and are widely used on the Web.
can hold either JPEG or TIFF data,
together with extensive metadata.
an extensible format, often used for storing uncompressed digital photographs, and for interchange of images.
simple bitmapped image format that is native to Windows, but widely supported. BMP files are often uncompressed.
can include bitmapped image data, that may be compressed using JPEG
Camera raw data
used when complete control over image processing is required, but there is no standard format for camera raw data.
Adobe's DNG (Digital Negative) format
standard, based on the TIFF format, intended for archiving camera raw images.
de facto industry standard; the Gimp is an Open Source alternative
used for command-line processing.
Images are often organized into layers, which are like overlaid sheets that may have transparent areas.
In pixel point processing, each pixel's new value depends only on its old value.
Temporal and Non-Temporal
Two Media types
The media has an associated time aspect
Also known as a static media. It has the same representation regardless of time
Basic media for many multimedia systems
Texts consists of two structures:
Based on creating letters, numbers and special characters.
The graphic representations of the alphabet, numbers and special character.
Usually vary by type sizes and styles
Particular size of typefaces
Usually vary by type sizes and styles.
effects that are useful for bringing viewer's attention to content:
Serif or Sans Serif
Two classes of fonts:
fonts use decorative tips or flags at the ends of a letter strokes
fonts don't have these features
usually used for documents or screens that have large quantities of text
considered better because of the sharper contrast.
an upstroke on a character
the down stroke below the baseline of a charac
spacing above and below a font or Line spacing
spacing between characters
space between pairs of characters, usually as an overlap for improvement appearance
depend to the size and the pixel numbers - File size increases as more sizes are added
can draw any size by scaling the vector drawing primitives mathematically
the jagged edges you see when a bitmapped image is resized
technique that can be used to eliminate jagged edges
text in an electronic format that can be read and interpreted by humans
similar but it also embeds special control characters into the text to provide additional features
an advance on rich text which allows the reader to jump to different sections within the document or even jump to a new document
1. Subtractive Theory
2. Additive Theory
Types of Colour Theories
Black absorbs most light
White reflects most light
M Y C
Black radiates no light
White (sun) radiates all light
R G B
The Colour Wheel
Hue or Spectral
Colour is represented as an angle.
Saturation or Chroma
Chroma is the intensity of a colour
the quality by which we distinguish a light colour from a dark one
represents the luminescent contrast value between black and white
One Hue many values of Tint and Shade
Colours that are opposite on the wheel. High Contrast
A selection of colours that are adjacent. Minimal contrast
First half of the wheel give warmer colours. The colours of fire.
Second half of the wheel gives cooler colours
Black and white with all the grays in-between
: Also called neutral relief. Dull colours, low contrast.
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