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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] What is TIFF G4? |
| Date: |
06/26/2005 08:25:01 PM |
| From: |
Nguyen Huu Hoa |
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Dear Frank Warmerdam,
Thank you so much for your help.
HOA
HOA,
TIFF is a raster file format "owned" by Adobe. See:
http://www.awaresystems.be/imaging/tiff/faq.html
TIFF G4 means a TIFF file using G4 compression. G4 is a "fax"
compression used for 2 color fax images (black and white).
TIFF G4 "stripped" means that the TIFF file is organized into
image blocks that are horizontal strips of the file. That is blocks
consisting of one or more scanlines. TIFF files can be either
"tiled" or "stripped", with the stripped organization being the
default or baseline organization.
A wide variety of software packages can produce and consume
TIFF G4 stripped files, so a list would be difficult to offer. But
keep in mind that G4 compression is only suitable for black and
white images. If you produce a black/white TIFF image by some
suitable means, you can G4 encode it with the "tiffcp" utility provided
as part of the libtiff page.
http://www.remotesensing.org/libtiff/
I hope this helps a bit.
Best regards,
--
---------------------------------------+------------------------------------
--
I set the clouds in motion - turn up | Frank Warmerdam,
warmerdam@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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