Digital Photography: A to Z (Part 17)

 R 

Ram
RAM:
Random Access Memory. The user can read and write data from/ onto this type of memory. RAM is used to temporarily store both data and programs. As opposed to ROM, all memory stored in RAM is lost when the power is turned off and is therefore called volatile memory.


Raster Length:
The number of raster points that can be displayed per inch. Given in lines per centimeter (L/cm) or per inch (lpi). A 60 raster is 60 L/ cm or 152 lpi.



Real Image Viewfinder
Real Image Viewfinder:
Optical real image viewfinder.





Reflected Light Metering
Reflected light metering:
Method of exposure metering by which the amount of light reflected from the subject is measuared.




Resolution
Resolution:
Measurement of the image detail (dots per inch/centimeter ) that a device can capture or reproduce. With a monitor or printer, the resolution describes the number of pixels that can be shown. 

When used for device for image capture, such as digital cameras or scanners, the resolution refers to the number of pixels that can be captured.

The result is given in dpi (dots per inch, 1inch= 2.54 cm), the horizontal and vertical total of pixels (e.g. 1,712 x 1,368 or 1,280 x 1,024) or in lpmm (line pairs per millimetre, which describes the highest number of thin black and white lines that can be displayed per millimeter). A good small image film has, for example, a resolution of approximately 150 lpmm (300 dpi rounded out to 118 dots per centimeter).

In general, it can be said that the higher resolution, the better the quality.











RGB
RGB:
Red, Green, Blue- the three basic colors for additive color mixture.






RISC
RISC:
Reduced Instruction Set Computer. A processor or system that has extremely fast processing times, but recognizes only a small number of commands.



ROM
ROM:
Read Only Memory. This type of memory storage only allows the user to "read" the information it contains. i.e. the user cannot store (write) any information on the ROM. Once written, the contents of the ROM cannot be changed.


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