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Rasterisation
The process of converting the text and images in a PostScript file into a bitmap.
Reflective media
Material that reflects light. Examples include paper and photographic prints.
Registration
The alignment of different printing plates to produce one printed image. Because printing
presses aren't consistently precise, variations in registration frequently occur. Even
minute shifts can cause noticeable problems, resulting in white gaps between a letter and
its coloured background or blurred overlapping between distinct colour areas.
Relief Printing
A type of printing that employs a printing plate with a raised image area.
Resampling
A process that changes the resolution or size of an image to alter the number of pixels it
contains. Upsampling increases the resolution, increasing the number of pixels;
downsampling reduces the resolution, decreasing the number of pixels in an image.
Resolution
In bitmaps, a measure of the size of pixels or dots that compose a bitmap.
In output devices, such as laser printers and monitors, resolution is a measure of the
size of dots used to reproduce images. Maximum resolution refers to the smallest dot that
an output device can produce. In scanners and other digital imaging devices, resolution is
a measure of the size of pixel used to sample an image. Resolution is measured in pixels
per inch (ppi) and dots per inch (dpi).
RIP (Raster Image Processor)
The component of an output device that converts the text and images in a PostScript file
into a bitmap.
RGB
An additive colour model in which three primary colours of light (red,
green, and blue) are combined in varying intensities to produce all other
colours. Monitors, scanners, and the human eye use RGB to produce or detect
colour.
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