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For example, a grayscale picture of the planet Saturn could be transformed into a color image to emphasize the differences in its rings. In image processing, lookup tables are often called LUTs (or 3DLUT), and give an output value for each of a range of index values.
A spreadsheet consists of a table of cells arranged into rows and columns and referred to by the X and Y locations. X locations, the columns, are normally represented by letters, "A," "B," "C," etc., while rows are normally represented by numbers, 1, 2, 3, etc. A single cell can be referred to by addressing its row and column, "C10".