bit map


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bit·map

or bit map  (bĭt′măp′)
n. Computers
A set of bits that represents a graphic image, with each bit or group of bits corresponding to a pixel in the image.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

bit′ map`


n.
a piece of text, a drawing, etc., represented, as on a computer display, by the activation of certain dots in a rectangular matrix of dots.
[1970–75]
bit′-mapped`, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Take the raw bit map that scanning generates, open it up in your image editing software, crop it, make it look presentable, and then choose the Save As function (or similar), and save your photo as a jpg.
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Query flexibility and the ability to perform index scans efficiently, as well as good selectivity from a combination of predicates in a where clause, means that a bit map index is useful in a data warehouse.
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