[vtkusers] Re: .raw Can't See Any Color

[Goodwin Lawlor]

Hi Nathaniel,

The VHP images are raw planar... not interlaced the way vtkImageReader
expects. You are seeing a grayscale image because you are only reading in
the first (monochrome) channel out of three.

I have a tcl script to read in a raw vhp image and display it in colour. You
can get it here:

http://www.bioengineering-research.com/vtk/vhpreader.tcl

You can get some test images to play with here:
ftp://ftp.nlm.nih.gov/visible/bitmaps/color24/
Decompress them first!

I was going to write a small vtk/tcl app to read/view/crop/write vhp raw
images but time doesn't permit. This script was an initial test. There are
shareware apps out there that can batch convert raw planar images to bmp/png
that vtk can read directly.


hth

Goodwin


"Mathieu Malaterre" <mathieu.malaterre at kitware.com> wrote in message
news:41768797.8050400 at kitware.com...
> Nathaniel,
>
> If the raw image is RGB, use:
>
> SetNumberOfScalarComponents 3
>
> http://www.vtk.org/doc/nightly/html/classvtkImageReader2.html#z2829_0
>
> HTH
> Mathieu
>
> Nathaniel Gonzalez wrote:
> > Hi:
> > I'm reading a raw image, this image is part of the human visible
> > project. When I display it I only see gray image. When I open the image
> > in photoshop with the following raw parameter Header 0, Width 2048,
> > Height 1216, Count 3, Bits 8, Interlaced No I get a full color image. If
> > any one knows what can be my error please let me know. This is how I'm
> > doing it.
> >
> > vtkImageReader part
> >      part SetFileName "a_vm1002.raw"
> >      part SetDataSpacing 0.33 0.33 1.0
> >      part SetDataExtent 0 2047 0 1215 0 0
> >      part SetDataScalarTypeToUnsignedChar
> >
> >  vtkImageActor imageActor
> >     imageActor SetInput [ part GetOutput ]
> >
> > I don't know how to add the parameter Count or Interlaced.
> >
> > Thanks for any help.
> >
> > Nathaniel Gonzalez
> > Programmer
> > University of Puerto Rico
> > Medical Science Campus
> >
> >
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>
>
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