[Insight-developers] AnaluzeImageIO filename extensions

[Hans Johnson]

Julien,

It really needs to look for the following:
.hdr    (I'd guess 60% of the time this is what users will supply)
.img.gz (I'd guess 21% of the time this is what the user will supply)
.img    (I'd guess 19% of the time this is what the user will supply)

Compressed .hdr files are not supported by ITK.  It is not that big of a
deal, because the .hdr files are always only 384 bytes long.

Thanks,
Hans

PS:  In 6 months or so, we hope to incorporate the NiFtI file format.  This
is meant to be a first step at a cross functional imaging tool format (SPM,
fsl, afni, fmristat...).  Unfortunatly, it is based off the Analyze file
format and is about 95% compliant, 5% non-compliant and uses the same file
extensions.  We hope that all the non-compliant parts can be reconciled and
the current itkAnalyzeFileIO class will be able to handle both formats
appropriately.



-----Original Message-----
From: Julien Jomier [mailto:jjomier at cs.unc.edu] 
Sent: Sunday, January 09, 2005 10:12 AM
To: hans-johnson at uiowa.edu
Cc: insight-developers at public.kitware.com
Subject: Re: [Insight-developers] AnaluzeImageIO filename extensions

Hi Hans,

Thanks for the quick reply.
To make things clear, what filename should set a typical user when using 
the itkImageFileReader/Writer? (.hdr only?). I mean, can we restrict the 
AnalyzeIOMethod to this extension only in the CanRead() function? (if 
yes, this should speedup the IO process a little bit).

Julien

Hans Johnson wrote:
> Julien,
> 
> The analyze file format is actually a collection of files with the same
> basename.  The file extensions are for optional image components:
> 
> .hdr - A required file that contains meta-data information and image
> dimensions/resolutions/datatype/orientation
> [.img|.img.gz] - A required* raw datafile that is uncompressed
> .lkup - NOT IMPLEMENTED IN ITK YET  a simple RGB color index file
> .obj  - NOT IMPLEMENTED IN ITK YET  a run-length encoded file that is a
code
> image to define segemented regions of the image.
> 
> *It has become very common practice to compress .img image with gzip
> compression, so we have allowed .img.gz as an extension.
> 
> Regards,
> Hans
> 
> 
> 
> -----Original Message-----
> From: insight-developers-bounces at itk.org
> [mailto:insight-developers-bounces at itk.org] On Behalf Of Julien Jomier
> Sent: Sunday, January 09, 2005 6:21 AM
> To: insight-developers at public.kitware.com
> Subject: [Insight-developers] AnaluzeImageIO filename extensions
> 
> Hi,
> 
> I'm trying to fix a bug reported on the user's list regarding 
> AnalyzeImageIO trying to read a file even if the filename was submitted 
> as .bmp 
>
(http://public.kitware.com/pipermail/insight-users/2005-January/011688.html)
> 
> The fix is easy but I need to know the possible filename extensions for 
> the Analyze file format. Currently I've .hdr, .img, .hdr.gz, .img.gz.
> 
> Is Analyze supporting any other extensions?
> 
> Thanks,
> 
> Julien
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