Programming.ImageCompression History

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September 22, 2008, at 04:26 PM by OtherMichael -
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>>important<<
!!! Ia recommended
"If your target application supports them, you should (for binary images) choose TIFF Group 4 which can achieve a 20:1 to 50:1 compression ratio, depending on the characteristics of the images."

source: Image Export manual ([@iaeximg.chm@]), section ''[=Export a number of popular image file formats=]''
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InputAccel.ImageExport
 
 
September 22, 2008, at 04:25 PM by OtherMichael -
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!! [[#General]] General Notes
In every process that I'm aware of, we're exporting TIF, binary (eg, black & white), CCITT Group 4 compression. In both test and production -- there's never a difference between the two. --[[~MichaelPaulukonis]]

Except for Xray JPEGs.

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[[IT.Xray]]
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January 23, 2008, at 09:23 AM by MichaelPaulukonis - xray xref, question
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Except for Xray JPEGs.

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InputAccel.ImageExport
[[IT.Xray]]
 
 
January 22, 2008, at 03:44 PM by MichaelPaulukonis -
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In every process that I'm aware of, we're exporting TIF, binary (eg, black 7 white), CCITT Group 4 compression. In both test and production -- there's never a difference between the two. --[[~MichaelPaulukonis]]

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In every process that I'm aware of, we're exporting TIF, binary (eg, black & white), CCITT Group 4 compression. In both test and production -- there's never a difference between the two. --[[~MichaelPaulukonis]]

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>>important<<
!!! Ia recommended
"If your target application supports them, you should (for binary images) choose TIFF Group 4 which can achieve a 20:1 to 50:1 compression ratio, depending on the characteristics of the images."

source: Image Export manual ([@iaeximg.chm@]), section ''[=Export a number of popular image file formats=]''
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January 22, 2008, at 03:41 PM by MichaelPaulukonis -
Added lines 1-26:
!! [[#General]] General Notes
In every process that I'm aware of, we're exporting TIF, binary (eg, black 7 white), CCITT Group 4 compression. In both test and production -- there's never a difference between the two. --[[~MichaelPaulukonis]]


!! CCITT
It's a run-length Huffman-encoding

http://www.faqs.org/faqs/graphics/fileformats-faq/part3/section-26.html
http://www.adventimaging.com/support/ccitt.htm
http://docs.sun.com/app/docs/doc/802-5863/6i9jfuk34

>>clip lrindent<<
TIFF CCITT Group 4
These are TIFF CCITT files in a format that is more advanced and more compressed than TIFF CCITT Group 3.

source: http://www.leadtools.com/SDK/RASTER/FORMATS/Raster-Format-TIFF-Fax.htm
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!! [[#SeeAlso]] See Also


!! [[#Categories]] Category tags
[[!programming]] [[!graphics]]