[vtkusers] Rendering RAW image format

[anast.jm at pg.com]

I'm not sure (I've not read color images before) but maybe the color components
are the problem. Try SetNumberOfScalarComponents (int) to 3 (this is a super
class method of ImageReader2)??  ....john


                                                                
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From: "Stephen Reilly" <stephen.reilly at ntlworld.com>@public.kitware.com on
11/11/2002 09:25 PM GMT
                                                                                                       
   "Stephen Reilly" <stephen.reilly at ntlworld.com>           To:   "VTK-Users"                          
                              @public.kitware.com        <vtkusers at public.kitware.com>                 
                                                            Cc:    (bcc: John Anast-JM/PGI)            
                                                    Subject:      [vtkusers] Rendering RAW image       
      Sent by:  vtkusers-admin at public.kitware.com        format                                        
                              11/11/2002 04:25 PM                                                      
                                                                                                       
                                                                                                       





Dear VTK-users,


I have a series of RAW images I wish to render. I  know their sizes, how they
are laid out, and can open them in Paintshop Pro, but  I can not get them to
render in VTK. I think that this may have something to do  with the
vtkImageReader I am using.

The pictures are color bit mapped, RGB 24 bit  planar images, with a pixel size
of 0.33.

I have used the code below to read in images  before, and successfully rendered
them, but this format seems to be causing some  difficulty as all that is
rendering is a black rectangle.

Any help you can provide would be greatly  appreciated,
Stephen


Please find the code attached:

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

#Set the origins to the corners - since we are  setting the
set origin_x [expr ( 1216 / 2.0 ) *  $PIXEL_SIZE * -1.0]
set origin_y [expr ( 2048 / 2.0 ) * $PIXEL_SIZE *  -1.0]

vtkImageReader reader
    reader  SetDataExtent 0 1215 0 2048 1 5
    reader  SetDataVOI 0 1215 0 2048 1 5
    reader SetFilePrefix  $BASENAME
    reader SetDataSpacing 0.33 0.33  1.0
    reader SetDataOrigin $origin_x  $origin_y 0
    reader SetHeaderSize
    reader  SetDataByteOrderToBigEndian
    reader  SetDataScalarTypeToUnsignedShort
    reader SetDataMask  0x7fff
    [reader GetOutput]  GlobalReleaseDataFlagOn;

vtkImageCast cast
    cast  SetInput [reader GetOutput]
    cast  SetOutputScalarTypeToUnsignedChar

vtkVolumeRayCastCompositeFunction  compositeFunction

vtkVolumeRayCastMapper  volumeMapper
    volumeMapper SetVolumeRayCastFunction  compositeFunction
    volumeMapper SetInput [cast  GetOutput]

vtkVolume volume
    volume  SetMapper volumeMapper


I then go on to render it as normal.
I have also tried setting the reader as  UnsignedChar to no avail.

Thanks for reading this far,
Stephen