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1 table lookup
"The process of using a known value to search for data in a previously constructed table of values: for example, using a purchase price to search a tax table for the appropriate sales tax." -
2 Lookup field
A field in a table that draws data from another table. -
3 gamma ramp
"A lookup table (LUT) of numeric values that is used to compensate for a particular monitor's color response. The table has three parts (one each for red, green, and blue), and each part has 256 lookup values. A gamma ramp is used to map the range of possible intensities for each color to a limited number (256) of values. An independent hardware vendor (IHV) chooses these values so that the transition from one color intensity to the next is as smooth as possible (since the eye perceives changes in light intensity nonlinearly)." -
4 posterizing operation
A lookup table operation that reduces the number of colors used in an image.
См. также в других словарях:
table lookup — Searching for data in a table; commonly used in data entry validation and any operation that must match an item of data with a known set of values … IT glossary of terms, acronyms and abbreviations
lookup — look up n. (Computers) an operation that determines whether one or more of a set of items has a specified property; as, they wrote a program to do a table lookup. Syn: search. [WordNet 1.5] … The Collaborative International Dictionary of English
Lookup table — In computer science, a lookup table is a data structure, usually an array or associative array, often used to replace a runtime computation with a simpler array indexing operation. The savings in terms of processing time can be significant, since … Wikipedia
Lookup — In computing, lookup usually refers to searching a data structure for an item that satisfies some specified property . For example, variable lookup performed by a (scripting) language interpreter, virtual machine or other similar engine usually… … Wikipedia
Lookup table — Una lookup table (del inglés tabla de consulta ) es, en informática, una estructura de datos, normalmente un arreglo o un arreglo asociativo, que se usa para substituir una rutina de computación con una simple indexación de los arreglos. Son muy… … Wikipedia Español
lookup — noun an operation that determines whether one or more of a set of items has a specified property (Freq. 8) they wrote a program to do a table lookup • Syn: ↑search • Hypernyms: ↑operation … Useful english dictionary
Hash table — Not to be confused with Hash list or Hash tree. Unordered map redirects here. For the proposed C++ class, see unordered map (C++). Hash Table Type unsorted dictionary Invented 1953 Time complexity in big O notation Average Worst case Space … Wikipedia
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Mathematical table — Before calculators were cheap and plentiful, people would use mathematical tables lists of numbers showing the results of calculation with varying arguments to simplify and drastically speed up computation. Tables of logarithms and trigonometric… … Wikipedia