[Insight-users] Big tiff images

[Bradley Lowekamp]

Hello,

I think all we need is to upgrade to the latest libtiff, unless we want to deal with geo meta data.

From http://en.wikipedia.org/wiki/Tagged_Image_File_Format:

A classic TIFF file format uses 32-bit offsets and, as such, file size is limited to 4 GiB (4,294,967,296 bytes). BigTIFF is a TIFF variant file format, which can contain more than 4GiB of data by using 64-bit offsets.[10] Support for BigTIFF file formats among applications is limited since the file format specification was only recently implemented (2007) in LibTIFF version 4.0, which is currently in beta development.

From http://en.wikipedia.org/wiki/GeoTIFF:

GeoTIFF is a public domain metadata standard which allows georeferencing information to be embedded within a TIFF file. The potential additional information includes map projection, coordinate systems, ellipsoids, datums, and everything else necessary to establish the exact spatial reference for the file. The GeoTIFF format is fully compliant with TIFF 6.0, so software incapable of reading and interpreting the specialized metadata will still be able to open a GeoTIFF format file.[1]



The current version of TIFF we have is 3.7.2. So it may be a matter of upgrading the library, and making sure we use the right types, and add streaming support to the tiff ImageIO too.

Brad




On Jun 17, 2010, at 10:39 AM, Luis Ibanez wrote:

> 
> Should we create a GDALImageIO class ?
> 
> Or is it the GeoTiff library what we should add support for ?
> 
>             http://trac.osgeo.org/geotiff/
> 
> 
> We have some ongoing effort on adding
> JPEG2000ImageIO and HDF5ImageIO
> 
> http://www.na-mic.org/Wiki/index.php/JPEG2000_and_HDF5_Image_Readers_in_ITK
> 
> http://www.itk.org/Wiki/Proposals:JPEG_2000_ImageIO
> 
> This may be a consistent effort along the same direction.
> 
> 
>     Luis
> 
> 
> -------------------------------------------------------------------------
> On Wed, Jun 16, 2010 at 5:46 PM, Conrad Bielski <conrad_bielski at yahoo.com> wrote:
> Hi,
> another option is to use the Orfeo Toolbox which is compatible with both ITK and GDAL already: http://www.orfeo-toolbox.org .
> Good luck!
> Conrad :)
> 
> 
> 
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========================================================
Bradley Lowekamp  
Lockheed Martin Contractor for
Office of High Performance Computing and Communications
National Library of Medicine 
blowekamp at mail.nih.gov


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