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Thus, a representation that compresses the storage size of a file from 10 MB to 2 MB yields a space saving of 1 - 2/10 = 0.8, often notated as a percentage, 80%. For signals of indefinite size, such as streaming audio and video, the compression ratio is defined in terms of uncompressed and compressed data rates instead of data sizes:
File size is a measure of how much data a computer file contains or how much storage space it is allocated. Typically, file size is expressed in units based on byte . A large value is often expressed with a metric prefix (as in megabyte and gigabyte ) or a binary prefix (as in mebibyte and gibibyte ).
The current PDF specification, ISO 32000-1:2008, is available from ISO's website, and under special arrangement, without charge from Adobe. [ 28 ] Because the format is designed to reproduce fixed-layout pages, re-flowing text to fit mobile device and e-book reader screens has traditionally been problematic.
Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
Readable prose size: the amount of viewable text in the main sections of the article, not including tables, lists, or footer sections. Wiki markup size: the amount of text in the full page edit window, as shown in the character count in the article's page history. Browser page size: the total size of the page as loaded by a web browser.
Holography applications demand even greater pixel density, as higher pixel density produces a larger image size and wider viewing angle. Spatial light modulators can reduce pixel pitch to 2.5 μm, giving a pixel density of 10,160 PPI. [8] Some observations indicate that the unaided human generally can't differentiate detail beyond 300 PPI. [9]
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