[vtkusers] Re: 16 bit MIP

[Hugo Gratama van Andel]

Hello Dan,
Thanks for your reply. I agree that the eye can't see all the different 
grey colors, if you display the whole range at once. The underlying 
reason for my question is that I want to create the MIP images (in batch 
mode from different angles) and later on to choose the window and level 
of the images (within different image viewing software than VTK).
I hope someone can tell me how to create 16-bit quality MIP's with vtk.
with regards,
Hugo

Dan White wrote:
> Hi,
> 
> 
> I would like to create 16 bit MIP images of my CT-datasets. I use a
> script as shown below with a vtkVolumeRayCastMIPFunction. If I capture
> my images with vtkWindowToImageFilter I will end up with 8-bit images
> (or 24-bit RGB). What should I do to create 16-bit MIP images (native,
> so without any upcasting). Should I set an option in
> vtkVolume(Property), or in vtkColorTransferFunction or some where else?
> Or is is it just impossible?
> with regards,
> Hugo Gratama van Andel
> 
> 
> Can you tell the difference between an 8 bit image and a 16 bit image  
> by eye?
> I cant in my case of confocal microscopy...
> 
> or are you extracting some scalar range and inflating it, and  throwing 
> away the
> ranges you dont want to see?
> 
> By the time you get to making an MIP if  a data set, I dont know how  
> much more information
> your eye really gets from the image being 18 bit, or even 12 bit
> compared to 8 bit?
> 
> our VTK powered software resamples imported images to 8 bit
> but does warn the user it does that.
> www.bioimagexd.org
> 
> not sure what OSIRIX does
> 
> Dan
> 
> 
> 
> 
> Dr. Daniel James White BSc. (Hons.) PhD
> Bioimaging Coordinator
> Nanoscience Centre and Department of Biological and Environmental  Sciences
> Division of Molecular Recognition
> Ambiotica C242
> PO Box 35
> University of Jyväskylä
> Jyväskylä
> FIN 40014
> Finland
> 
> +358 14 260 4183 (work)
> +358 468102840 (mobile)
> http://www.bioimagexd.org
> http://www.chalkie.org.uk
> dan at chalkie.org.uk
> white at cc.jyu.fi
> 
> 

-- 
Hugo Gratama van Andel - MSc
Academic Medical Centre - University of Amsterdam
Dept. Medical Physics      L0-152
Meibergdreef 9
1105 AZ Amsterdam
The Netherlands
Phone  :  +31 20 566 5206
FAX    :  +31 20 691 7233
e-mail :  h.a.gratamavanandel at amc.uva.nl