[vtkusers] Extract a slice and save it as jpg/png

[David Gobbi]

Hi Chris,

This could be an instance of trying to write 16-bit data to a JPEG
file.  Try adding vtkImageMapToColors with a suitable vtkLookupTable.
 The Range of the lookup table will have to be set to something
reasonable for the image, a range of (-1024, +4095) is a good place to
start and then you can increase or decrease the range in order to get
the contrast right.

   David


On Tue, Jul 13, 2010 at 2:15 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> Post you entire example. And, if you can post a link to your data...
>
> On Tue, Jul 13, 2010 at 3:57 PM, Chris Turner
> <cturnercomplex at googlemail.com> wrote:
>> Hi Bill,
>>
>> thanks for your answer! But didn't do the trick.
>> So strange I thought this was a standard question and procedure. And
>> that there has to be a easy way to do that.
>>
>> And why don't I even get a error message or something. Even when I
>> turn on the debug mode there is nothing suspicious.
>>
>> Anybody has another approach?
>>
>> Thanks
>> Chris
>>
>> On Mon, Jul 12, 2010 at 10:16 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>>> Try,
>>> voi.SetVOI(0,0,0,511,511,0)
>>>
>>> On Mon, Jul 12, 2010 at 10:07 AM, Chris Turner
>>> <cturnercomplex at googlemail.com> wrote:
>>>> Really? Am I the only one with that problem?
>>>>
>>>> On Fri, Jul 9, 2010 at 5:02 PM, Chris Turner
>>>> <cturnercomplex at googlemail.com> wrote:
>>>>> Hi Everyone!
>>>>>
>>>>> I'm trying to extract a slice from a vtkImageData object and save it as picture.
>>>>>
>>>>> That's how I do it:
>>>>>
>>>>> voi=vtkExtractVOI()
>>>>> voi.SetInput(imageData)
>>>>> voi.SetVOI(0,0,0,512,512,1)
>>>>> voi.Update()
>>>>>
>>>>> writer=vtkJPEGWriter()
>>>>> writer.SetInput(voi.GetOutput())
>>>>> writer.SetFileName("slice.jpg")
>>>>> writer.Write()
>>>>>
>>>>> ImageData is 512x512x40 spacing 1,1,1
>>>>>
>>>>> The strange thing is I don't get an output nor an error message. So I
>>>>> think I'm missing something here.... but it can't figure out what.
>>>>>
>>>>> So does anybody have an idea or a better solution?
>>>>>
>>>>> Thanks
>>>>> Chris
>>>>>
>>>> _______________________________________________
>>>> Powered by www.kitware.com
>>>>
>>>> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>>>>
>>>> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>>>>
>>>> Follow this link to subscribe/unsubscribe:
>>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>>>
>>>
>>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>