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Glossary of industry terms 3/3

PDF
Adobe Acrobat PDF format is based on the PostScript level 3 language and PDF files can represent both vector and bitmap graphics.
PICT
A graphics file format used primarily on Macintosh computers. PICT files can contain both object-oriented and bit-mapped graphics. There are two types: PICT I and PICT II. PICT II is the current standard and supports colour up to 24-bit.
Pixel (PICture ELement)
The smallest element of a digitised image. Also, one of the tiny points of light that make up a picture on a computer screen.
Pixels per inch (PPI)
A measure of how much detail you see in your images.

PostScript
A page description language developed by Adobe Systems, Inc. to control precisely how and where shapes and type will appear on a page. Software and hardware may be described as being PostScript compatible

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Raster
Raster images are made up of individual dots; each of which have a defined value that precisely identifies its specific colour, size and place within the image. (Also known as bitmapped images.)
Render
The final step of an image transformation or three-dimensional scene through which a new image is refreshed on the screen.
Resolution
The number of pixels per unit length of image. For example, pixels per inch, pixels per millimeter, or pixels wide.

RGB
Short for Red, Green, and Blue; the primary colours used to simulate natural colour on computer monitors and television sets. Also the primary colours used in photographic film/paper layers and photographic digital imaging equipment.

RIP(Raster Image Processing)
A piece of hardware or software that converts object-oriented graphics and fonts into the bit maps required for output on a printer.

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Saturation
The degree to which a colour is undiluted by white light. If a colour is 100 percent saturated, it contains no white light. If a colour has no saturation, it is a shade of gray.
Smoothing
Averaging pixels with their neighbours. It reduces contrast and simulates an out-of-focus image
Subtractive colours
Transparent colours that can be combined to produce a full range of colour. Subtractive colours subtract or absorb elements of light to produce other colours.

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TIFF (Tagged Image File Format)
The standard file format for high-resolution bit-mapped graphics. TIFF files have cross-platform compatibility.

TWAIN
Protocol for exchanging information between applications and devices such as scanners and digital cameras. TWAIN makes it possible for digital cameras and software to "talk" with one another on PCs.

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USB (Universal Serial Bus)
The USB offers a simplified way to attach peripherals and have them be recognised by the computer. USB ports are about 10 times faster than a typical serial connection. These USB ports are usually located in easy to access locations on the computer.
Unsharp Masking
Used to sharpen edges in an image.

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Vector Graphics
Images that are stored as lines and curves, instead of pixels. Unlike bitmap graphics, vector

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