Help with handling 27 gigapixel image

Leonid Bloch lb at
Fri May 4 20:37:04 EDT 2012

Hi Benjamin,

I figured out a solution! After many different(!) errors and not correct
representations, I compiled the latest libtiff from source and compiled
OpenSlide with it, instead of the libtiff that came with Ubuntu 11.10.
Now the display is correct!

Plus, I've looked over the code, and started to learn some Python. I wanted
to learn some serious programming language (apart from Maple and shell
scripting, which I know) long ago, although I study materials engineering
and computers are more of a hobby for me. Many people told me that Python
is a good place to start. So that's a good starting point!

Thank you very much,

On Sat, May 5, 2012 at 12:29 AM, Benjamin Gilbert <bgilbert at>wrote:

> On 05/04/2012 06:17 AM, Leonid Bloch wrote:
>> I did exactly as you said, and I've got display of something. But what I
>> got displayed is just some parts of my image, not the whole thing.
>> I've tried it with the smaller version first, which is a ~700 megapixels
>> 16bit unsigned grayscale tiff pyramid.
>> I also tried, and I've got a folder with subfolders
>> with tiles in them, and still, only part of the image was there, even on
>> tiles in lower number directories, which are supposed to hold large
>> portions of the image. From the data displayed, I have the feeling that
>> it takes just a part of an image and multiplies it to cover the whole
>> image surface...
>> I got the very same image displayed correctly in nip2 (VIPS GUI) so I
>> guess the problem is not with it.
>> Do you have any idea of what the problem might be?
> Hi Leonid,
> What version of OpenSlide are you using?  Version 3.2.5 had a bug that
> could sometimes result in errors like this.
> Did the 700 megapixel version also display incorrectly?
> Were any error messages produced by
> What are the X/Y dimensions of your images?
> Thanks
> --Benjamin Gilbert
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