FW: [vtkusers] Using and/or seperating original image colors

[don.casteel]

I haven't seen any replies to my questions and thought maybe my post
didn't go out......



In short I want to read in a series of BMP or PNG images and display
them as a volume with the original colors and opacity (RGB or RGBA). It
seems simple enough, but for some reason vtk doesn't make it obvious how
to do it.



I can read in the images and display them as a volume, but only with
color and opacity gradients, not the original colors.



Can someone please point me in the right direction?



I'd also like to separate a 3D image into multiple 3D images (1-Red,
1-Green, 1-Blue, 1-Alpha) so I can create contour surfaces for each.
(again, I am able to make contour surfaces, just not the ones I need)



Any suggestions on this one?



Thanks

Don







From: Casteel, Don
Sent: Thursday, October 13, 2005 9:08 AM
To: vtkusers at vtk.org
Subject: [new user] Using and/or seperating original image colors



Hello Everyone,



I am new to vtk and this user list, please bear with me.

(BTW I have tried reading through the list archives with no luck)



I am trying to read in multiple images and visualize them as a volume.

I have been able to read the images and render surface contours and
volumes (not the way I need them)



First.... I have been unable to figure out how to use the colors and
opacity from the original images in a volumeMapper.

Nothing I try works...  VTK seems to only allow converting the pixel
values to a single scalar and apply a color and opacity gradient against
that single scalar.

By setting the vtkPolyDataMapper.ScalarVisibilityOn I can get a
polysurface colored with the original image colors, But I can't find a
way to do that with the VolumeMappers.



Second... I'm not able to figure out how to separate the colors into
separate surfaces, again VTK forces the color values into a single
gradient.



This is all very confusing and frustrating because each of the colors
and the Alpha value in my images mean something different, and VTK seems
to force them into a single combined value.



I need to be able to pull out the individual RGBA components into
separate ImageData objects but this seems to be against the rules of VTK



I will really appreciate any suggestions that may help me out



Thanks



Don Casteel - Manufacturing Engineer
Delphi Thermal & Interior
4605 Airport Road
Gadsden, Alabama 35904



Office:  256-413-4118
Cell:     256-312-9195
D/C:     154*82240*28









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