2.4-FileFormats

2.4-FileFormats - CS 682 1 ’& $ Image File Formats...

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Unformatted text preview: CS 682 1 ’ & $ % Image File Formats Image file formats: bitmap, jpeg, tiff, gif, mpeg, pgm, ppm Image files have two parts: • header – file type info, magic number – image dimensions – color palette,. . . • raster data — image pixels CS 682 2 ’ & $ % Manipulating Images Existing software for file format conversions: • Matlab • pbmplus (Unix, Linux) • xv (Unix, Linux) • ImageMagick (Unix, Linux, Windows, Mac) • Vision SDK (Windows) CS 682 3 ’ & $ % Portable Gray Map: PGM The portable graymap format is a lowest common denominator grayscale file format. The definition is as follows: • A “magic number” for identifying the file type. A pgm file’s magic number is the two characters “P2”. • Whitespace (blanks, TABs, CRs, LFs). • A width, formatted as ASCII characters in decimal. • Whitespace. • A height, again in ASCII decimal. • Whitespace. • The maximum gray value, again in ASCII decimal....
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2.4-FileFormats - CS 682 1 ’& $ Image File Formats...

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