Given a quick look at your image, made geoserver eat it, here is the result:

http://imagebin.org/46575    no style
http://imagebin.org/46576    dem style

My guess is that udig is rendering this geotiff with the default
rendering, which means without a proper SLD, and depending on the
scale only part of the data get's rendered. By default I try to
rescale the dynamici to 8 bits using a linear stretch between original
min and max.

Simone.
-------------------------------------------------------
Ing. Simone Giannecchini
GeoSolutions S.A.S.
Owner - Software Engineer
Via Carignoni 51
55041  Camaiore (LU)
Italy

phone: +39 0584983027
fax:      +39 0584983027
mob:    +39 333 8128928


http://www.geo-solutions.it
http://simboss.blogspot.com/
http://www.linkedin.com/in/simonegiannecchini

-------------------------------------------------------



On Sun, Apr 19, 2009 at 8:53 PM, Simone Giannecchini
<[email protected]> wrote:
> Please, send it over.
>
> Simone.
> -------------------------------------------------------
> Ing. Simone Giannecchini
> GeoSolutions S.A.S.
> Owner - Software Engineer
> Via Carignoni 51
> 55041  Camaiore (LU)
> Italy
>
> phone: +39 0584983027
> fax:      +39 0584983027
> mob:    +39 333 8128928
>
>
> http://www.geo-solutions.it
> http://simboss.blogspot.com/
> http://www.linkedin.com/in/simonegiannecchini
>
> -------------------------------------------------------
>
>
>
> On Sun, Apr 19, 2009 at 8:49 PM, Ugo Taddei
> <[email protected]> wrote:
>> Hello Simone,
>>
>> thanks for answering.
>>
>> Simone Giannecchini said:
>>> Can you paste the reslt of a gdalinfo on the above mentioned tiff?
>>
>> Not now, as I'd have to get and install gdal. I have, however, a little
>> image (140kb) with which you can reproduce the problem. This I can send
>> you straight away, in case you want.
>>
>> Otherwise I'll email the info as soon as I can.
>>
>> Cheers,
>>
>> Ugo
>>
>>>
>>>
>>> Simone.
>>> -------------------------------------------------------
>>> Ing. Simone Giannecchini
>>> GeoSolutions S.A.S.
>>> Owner - Software Engineer
>>> Via Carignoni 51
>>> 55041  Camaiore (LU)
>>> Italy
>>>
>>> phone: +39 0584983027
>>> fax:      +39 0584983027
>>> mob:    +39 333 8128928
>>>
>>>
>>> http://www.geo-solutions.it
>>> http://simboss.blogspot.com/
>>> http://www.linkedin.com/in/simonegiannecchini
>>>
>>> -------------------------------------------------------
>>>
>>>
>>>
>>> On Sun, Apr 19, 2009 at 2:12 PM, Ugo Taddei
>>> <[email protected]> wrote:
>>>> Hello,
>>>>
>>>> I've got a world image which doesn't always display correctly. It is a
>>>> grayscale tiff. To the effect: it looks like only high pixel values are
>>>> displayed. I've got a different image from the same site, and it alyways
>>>> displays correctly. i can only see the correct image when i zoom out.
>>>>
>>>> I can send the image to the brave person willing to have a look into
>>>> this
>>>> issue.
>>>>
>>>> This is not related to the drag and drop issue I just posted. Again,
>>>> udig
>>>> version is trunk.
>>>>
>>>> Cheers,
>>>>
>>>> Ugo
>>>> _______________________________________________
>>>> User-friendly Desktop Internet GIS (uDig)
>>>> http://udig.refractions.net
>>>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>>>
>>> _______________________________________________
>>> User-friendly Desktop Internet GIS (uDig)
>>> http://udig.refractions.net
>>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>>
>>>
>>>
>>
>> _______________________________________________
>> User-friendly Desktop Internet GIS (uDig)
>> http://udig.refractions.net
>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>
>
_______________________________________________
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