[vtkusers] Resize an arbitrarily sized image

[Cameron Lowell Palmer]

From my standpoint an image is a bitmap, a field of dimensionless colored dots. When it comes to output it should be a matter of saying here is your space draw yourself here. So in my app, most objects are defined in mm because it just makes sense to do so for organs, but I have also imported a 2000x2000 px PNG. This is purely an experiment in dealing with image manipulation so the image is deliberately large. So I want this logo to be 7x7 cm in real terms.

Now I have some options, but the question is what is the VTK way?

* I can resample the image down to 70x70 and assign spacing of (1, 1, 1).
* I can scale the image plane it is applied to.
* Third option goes here.

I’ve tried vtkImageResample and when you set an axis magnification of 0.5f you get a doubling of spacing and a halving of extent, but the bounds mostly(!) remains the same. Still, this isn’t really what I want, I want to just say, “Mr. Image you are 70mm.” BTW Talking to the image data didn’t work either.


On 5. feb. 2015, at 14.37, Bill Lorensen <bill.lorensen at gmail.com<mailto:bill.lorensen at gmail.com>> wrote:


What do you mean by size of the image?

On Feb 5, 2015 3:21 AM, "Cameron Lowell Palmer" <cameron.palmer at ntnu.no<mailto:cameron.palmer at ntnu.no>> wrote:
I’m looking for a recommendation on how to scale imageData to a specific size.

I’ve used vtkImageResample, but what I really want to do is load a large image, and then reset the size at some point. Ideally I would be able to non-destructively change the size of the object.

Thanks,

cameron.


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