<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small">Perhaps the <a href="https://github.com/InsightSoftwareConsortium/ITK/blob/4456e0431b0d35f55eb1eadc5ca8a7c3fe2c8af9/Modules/IO/TIFF/src/itkTIFFImageIO.cxx#L595">condition</a> should be greater or equal? Because the equal case already wraps around using signed arithmetic.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 23, 2017 at 9:15 AM, Lowekamp, Bradley (NIH/NLM/LHC) [C] <span dir="ltr"><<a href="mailto:blowekamp@mail.nih.gov" target="_blank">blowekamp@mail.nih.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
You have correctly figured this out. Technically the regular tiff format can support up to 4GB, but in ITK we made the determination to switch to the BigTiff format at 2GB [1]. This is does to ensure that we can properly do signed integer arithmetic for the file format.<br>
<br>
I have also used ImageJ/FIJI and a program call IMOD [2] (another electron microscopy viewer) for viewing these big tiff files.<br>
<br>
HTH,<br>
Brad<br>
<br>
[1] <a href="https://github.com/InsightSoftwareConsortium/ITK/blob/4456e0431b0d35f55eb1eadc5ca8a7c3fe2c8af9/Modules/IO/TIFF/src/itkTIFFImageIO.cxx#L595" rel="noreferrer" target="_blank">https://github.com/<wbr>InsightSoftwareConsortium/ITK/<wbr>blob/<wbr>4456e0431b0d35f55eb1eadc5ca8a7<wbr>c3fe2c8af9/Modules/IO/TIFF/<wbr>src/itkTIFFImageIO.cxx#L595</a><br>
[2] <a href="http://bio3d.colorado.edu/imod/" rel="noreferrer" target="_blank">http://bio3d.colorado.edu/<wbr>imod/</a><br>
<div class="HOEnZb"><div class="h5"><br>
On 10/21/17, 8:40 PM, "Gib Bogle" <<a href="mailto:g.bogle@auckland.ac.nz">g.bogle@auckland.ac.nz</a>> wrote:<br>
<br>
I've managed to find the answer to one of my questions, by looking at the file header values. A TIFF file less than 2GB has these 4 header bytes:<br>
49 49 2A 00<br>
and over 2GB (BigTIFF) has<br>
49 49 2B 00<br>
ITK handles this automatically.<br>
<br>
I can view the big TIFFs with Fiji (ImageJ), so this is not a bad option for displaying the slices. What I like about Irfanview is that it's very light-weight. ImageJ loads the whole file into memory, which can take some time, while Irfanview loads one slice at a time.<br>
<br>
I am not keen about Slicer - it is a real heavy-weight - and Tomviz is very specialised, designed for viewing tomography data, i.e. images in a tilt series.<br>
______________________________<wbr>__________<br>
From: Matt McCormick <<a href="mailto:matt.mccormick@kitware.com">matt.mccormick@kitware.com</a>><br>
Sent: Sunday, 22 October 2017 4:48 a.m.<br>
To: Dženan Zukić<br>
Cc: Gib Bogle; Insight-users<br>
Subject: Re: [ITK-users] Big tiff file<br>
<br>
Hi,<br>
<br>
Since ITKv4, support for "BigTiff" was added, so ITK can support TIFF<br>
files larger than 4GB.<br>
<br>
One possible limitation may be the filesystem -- avoid FAT32 formatted<br>
filesystem that will run into size limits.<br>
<br>
The file could be viewed with a number of ITK-supported viewers, e.g.<br>
<br>
- 3D-Slicer: <a href="https://www.slicer.org/" rel="noreferrer" target="_blank">https://www.slicer.org/</a><br>
- ITK-SNAP: <a href="http://www.itksnap.org/" rel="noreferrer" target="_blank">http://www.itksnap.org/</a><br>
- Tomviz: <a href="http://www.tomviz.org/" rel="noreferrer" target="_blank">http://www.tomviz.org/</a><br>
<br>
HTH,<br>
Matt<br>
<br>
On Sat, Oct 21, 2017 at 11:40 AM, Dženan Zukić <<a href="mailto:dzenanz@gmail.com">dzenanz@gmail.com</a>> wrote:<br>
> Hi Gib,<br>
><br>
> TIFF is limited to 4GiB. Unless you must use TIFF, better switch to<br>
> MetaImage or NRRD.<br>
><br>
> Regards,<br>
> Dženan<br>
><br>
> On Sat, Oct 21, 2017 at 12:08 AM, Gib Bogle <<a href="mailto:g.bogle@auckland.ac.nz">g.bogle@auckland.ac.nz</a>> wrote:<br>
>><br>
>> Hi,<br>
>><br>
>><br>
>> I am joining a stack of 2D tiffs into a 3D tiff, and have run into a<br>
>> problem with big files. When the uncompressed size of the 3D file is more<br>
>> than 2GB I get an error when I try to view it with Irfanview. At first I<br>
>> thought maybe I needed to upgrade from ITK4.8.0, but after installing and<br>
>> using ITK4.12.2 I see that I have the same issue. Irfanview says:<br>
>><br>
>> "Invalid or unsupported TIF file"<br>
>><br>
>> I now suspect that the problem is not ITK-related, rather it is a<br>
>> limitation of Irfanview.<br>
>><br>
>> I have two questions:<br>
>><br>
>><br>
>> Is there a limit on the allowed size of a tiff file?<br>
>><br>
>> Is there another program (preferably free) that can open for viewing tiff<br>
>> files bigger than 2GB?<br>
>><br>
>><br>
>> It is useful but not essential for me to be able to view these big 3D<br>
>> files. I will use ITK functions to process the 3D files, and I'm assuming<br>
>> that any file that ITK can create it can also read.<br>
>><br>
>><br>
>> Thanks<br>
>><br>
>> Gib<br>
>><br>
>><br>
>> The ITK community is transitioning from this mailing list to<br>
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>> Kitware offers ITK Training Courses, for more information visit:<br>
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Kitware offers ITK Training Courses, for more information visit:<br>
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</div></div></blockquote></div><br></div>