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

[Chris Turner]

No didn't do the trick either.

No file, no error/warning message.

Thanks though!

On Wed, Jul 14, 2010 at 10:54 AM, Jothy <jothybasu at gmail.com> wrote:
> Try SetVOI(0,0,0,79,1,146)
>
> Jothy
>
> On Wed, Jul 14, 2010 at 3:44 PM, Chris Turner
> <cturnercomplex at googlemail.com> wrote:
>>
>> Hi David & Bill,
>>
>> thanks for your patience and your help I appreciate it a lot!  So this
>> is the code with David's suggestion:
>>
>> import os
>> import vtk
>> import sys
>>
>>
>> reader=vtk.vtkImageReader()
>> reader.SetFileName("/tmp/lungROI.vtk")
>> reader.Update()
>>
>> lut=vtk.vtkLookupTable()
>> lut.SetRange(-1024, +4095)
>>
>> map=vtk.vtkImageMapToColors()
>> map.SetInput(reader.GetOutput())
>> map.SetLookupTable(lut)
>>
>>
>> voi=vtk.vtkExtractVOI()
>> voi.SetInput(map.GetOutput())
>> voi.SetVOI(0,0,0,79,146,1)
>> voi.Update()
>>
>> writerp=vtk.vtkPNGWriter()
>> writerp.SetInput(voi.GetOutput())
>> writerp.SetFileName("/tmp/out.png")
>> writerp.Write()
>>
>> print "done"
>>
>>
>> .... but still no output nor an error message. You can take a look at
>> the Image here:
>>
>> http://www.load.to/t8MWurwasf/lungROI.vtk (~10mb)
>>
>> Thanks Again,
>> Chris
>>
>>
>> On Tue, Jul 13, 2010 at 4:38 PM, David Gobbi <david.gobbi at gmail.com>
>> wrote:
>> > 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
>> >>>>>>
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