Re: [mv2] Just display image with its LUT

Angus McMorland wrote:
>     If you have only one flat image to show then why do you
>     need the second array at all??  Can't you just view the other_img.png??
> 
> Sorry for not being clear: I only have one image - it's just that I 

And sorry for being slow in my response.  I got sucked into the 
scripting feature I just added and it consumed most of my time.

> don't know how to view an image with its colour information (in RGB 
> channels) in mv2. I don't just want to use any old image viewer, as I'm 
> trying to generate a 'stack' of colour images, like in the attached 
> example, which would look better in colour..

If the scalar data type of your scalar array is unsigned char then it is 
treated as a color.  If you want it to be treated as a scalar you can 
do, for example with the surface module:

  surface.actor.mapper.color_mode = 'map_scalars'

Then it will use the lut you pick to map the scalars.

> Is not an image just a 2D array of scalars that I could use to assign 
> colours? I understand that this way I would get different colours to the 

True but with the exception above.

> ones in the original image, but that would be okay, since you've got 
> such a good range of LUTs available. I've just bought one of the VTK 
> books, so I should gradually become more independent on these things, 
> but in the meantime a further explanation would be helpful. In the end 
> today, I hacked it by switching on filled contours, using 256 of them 
> with the range from 0 to 255, and then picking the LUT, in the module 
> manager, that I wanted. It seems this should be easier.

That will work but will cost you the contouring etc.  The above should 
also work fine.  Use what works best for you.

cheers,
prabhu