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Topic: PackBits


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  PackBits - Wikipedia, the free encyclopedia
PackBits is a fast, simple compression scheme for run-length encoding of data.
Apple introduced the PackBits format with the release of MacPaint on the Macintosh computer.
A PackBits data stream consists of packets of one byte of header followed by data.
en.wikipedia.org /wiki/PackBits   (141 words)

  
 PackBits -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-20)
PackBits is a fast, simple (Applying pressure) compression scheme for (Click link for more info and facts about run-length encoding) run-length encoding of data.
Apple introduced the PackBits format with the release of (Click link for more info and facts about MacPaint) MacPaint on the (A waterproof raincoat made of rubberized fabric) Macintosh computer.
This compression scheme is one of the types of compression that can be used in (A quarrel about petty points) TIFF-files.
www.absoluteastronomy.com /encyclopedia/p/pa/packbits1.htm   (165 words)

  
 Understanding PackBits
This Technote describes the format of data packed by the Toolbox utility PackBits and documents a change to the srcBytes limit and to the possible worst case.
PackBits never generates the value -128 ($80) as a flag-counter byte, but a few PackBits-like routines that are built into some applications do.
PackBits packs the data only when there are three or more consecutive bytes with the same data; otherwise it just copies the data byte for byte (and adds the count byte).
developer.apple.com /technotes/tn/tn1023.html   (609 words)

  
 Compressing and Decompressing TIFF Images
In general, Packbits compression is a good choice for fast decompression.
Packbits is fast, widely-supported, and provides good compression of sparse images, such as scanned documents.
Therefore, Packbits is a logical compression method for files you may send to various non-HP-UX systems.
docs.hp.com /en/B2355-90068/ch04s01.html   (1065 words)

  
 RLE SDK for Pocket PC - LEADTOOLS Imaging Library for Pocket PC 2002 RLE Compression Options   (Site not responding. Last check: 2007-10-20)
A perfect example of this would be a document image; the white background would create very long runs in certain areas of the image.
A flavor of RLE compression used in TIFF files is PackBits.
PackBits uses a control byte to indicate how the next byte or run of bytes to be used.
www.leadtools.com /SDK/pocketpc/Raster-Compression-RLE.htm   (255 words)

  
 MacPaint files   (Site not responding. Last check: 2007-10-20)
Using PackBits, the typical MacPaint file compresses down to around 10K bytes.
PackBits compacts a string of bytes by compressing runs of equal bytes.
If the bitmap is smaller than 576 by 720 (as will usually be the case), the bitmap is padded with white space.
www.mactech.com /articles/mactech/Vol.01/01.07/MacPaintfiles   (1022 words)

  
 LibTiff Mailing List Archive, "Re: Packbits errors", by Frank Warmerdam
I get no > error message, but the images have some small image corruptions where > pixels are shifted to the right a little bit.
Bernd, Packbits does not include any error correction, but if the data is corrupted in some way you should get the same results each time.
I would note the packbits decoder is really quite simple, and it is surprising there would be a bug in it after all these years.
www.asmail.be /msg0055338409.html   (244 words)

  
 [No title]
Files with none, LZW, or PackBits compression are supported, as well as those with some other compression schemes.
The supported classes have a variety of possible compression schemes of which JPEG, LZW, PackBits, CCITT 3 Fax, and CCITT 4 Fax are known to work.
It is also possible append the attribute WORLD to the option value, separated from other text by a space, in order to request that an Arc/Info style TIFF World file be generated.
pcigeomatics.com /cgi-bin/pcihlp/GDB|Supported+File+Formats|TIFF+(TIF)   (870 words)

  
 Victor Image File Formats
For photographic images PackBits (a run length encoding), JPEG, and LZW compressions are optional.
TIFF is probably the most widely used of all file formats.
Victor writes 1-, 8-, 16-, and 24-bit images with optional PackBits (run length encoded), Group 3, Group 4, JPEG, and LZW compression.
www.catenary.com /prodsumm/filetyps.html   (952 words)

  
 %%ItemTitle%%
The supported compression types include Packbits and LZW for color, Modified CCITT, and CCITT Group 3 and Group 4 Fax for b/w only.
The PACKBITS compression is a simple run length encoding method with moderate compression.
The default compression is PACKBITS for bi-level images and color images, unless you have a license agreement with UNISYS.
www.data-tech.com /help/imdll8/TIFF.html   (515 words)

  
 Priism Help: TIFF Save Plugin   (Site not responding. Last check: 2007-10-20)
No compression or a lossless compression method called packbits (a run-length encoding scheme) can be used with any of the image types.
TIFF extensions include support for other pixel types and depths (signed integers and floating point values, for instance) and alternate compression schemes.
The plugin only writes uncompressed images or images compressed with the packbits scheme.
util.ucsf.edu /IVE/IVE4_HTML/TIFF_Save.html   (273 words)

  
 DRGTools Version 0.30 - Beta Release>
Usage: drgtool grid [options] infile [outfile] Function: grid draws a UTM grid on a map Options: -c {lzw, zip, packbits, none} Compression type default is to use same as input file -q Be quiet -r Replace input file with output
Usage: drgtool join [options] infile1 infile2 outfile Function: join seamlessly joins two DRG maps Options: -c {lzw, zip, packbits, none} Compression type default is to use same as input file -f Create.fgd file for joined map -n "Map Name" Set map name to that specified -q Be quiet -r Replace existing file with output
Files are packbits compressed as distributed from USGS.
infomesa.com /~msw/drgtools   (1191 words)

  
 Pbmtolj User Manual   (Site not responding. Last check: 2007-10-20)
Prevents pbmtolj from writing the reset sequences to the beginning and end of the output file.
Enables use of both TIFF packbits, and delta-between-rows compression.
This option controls the "number of copies" printer control; pbmtolj generates only one copy of the image.
www.cise.ufl.edu /depot/www/netpbm/pbmtolj.html   (154 words)

  
 Man page of BMP2TIFF   (Site not responding. Last check: 2007-10-20)
image is created with data samples packed (PlanarConfiguration=1), compressed with the PackBits algorithm (Compression=32773), and with each strip no more than 8 kilobytes.
Specify a compression scheme to use when writing image data: -c none for no compression, -c packbits for the PackBits compression algorithm (the default), -c jpeg for the baseline JPEG compression algorithm, -c zip for the Deflate compression algorithm, and -c lzw for Lempel-Ziv and Welch.
Write data with a specified number of rows per strip; by default the number of rows/strip is selected so that each strip is approximately 8 kilobytes.
laurel.datsi.fi.upm.es /cgi-bin/man/man2html?bmp2tiff+1   (138 words)

  
 TIFF Viewer - Java, Fax G3, G4, Packbits, GIF, JPG, BMP, PNG, image processing   (Site not responding. Last check: 2007-10-20)
TIFF Viewer - Java, Fax G3, G4, Packbits, GIF, JPG, BMP, PNG, image processing
We are developing Java™ based image processing applications since 1996.
It will also provide many processing functions in order to support digital imaging requirements.
www.tiffy.de /company.html   (146 words)

  
 mmsc - Modified Huffman (MH), Modified READ (MR), Modified Modified READ (MMR), Base-64, PackBits In/OutputStream   (Site not responding. Last check: 2007-10-20)
Modified Huffman (MH), Modified READ (MR), Modified Modified READ (MMR), Base-64, PackBits, Little Endian
BitInputStream, BitOutputStream : Convert a bit stream into a byte stream (vice versa).
All software on this site is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation
www.mms-computing.co.uk /uk/co/mmscomputing/io   (318 words)

  
 File Formats (Read)
TIFF LSB - PACKBITS - TIFF v4/5/6 LSB, Packbits monolithic
TIFF LSB - STRIP PBIT - TIFF v4/5/6 LSB, Packbits stripped
TIFF MSB - STRIP PBIT - TIFF v4/5/6 MSB, Packbits stripped
www.sysu.com /ffori.htm   (965 words)

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