[Vv] Window Level Fusion Slider

[Simon Rit]

Hi Kumar,
There has been an update of vv wrt of fusion in which you might be
interested. Romulo has kindly added a transparency slider: all colors
below the selected value are fully transparent and don't alter the
background image. I hope that this will answer your (rather old)
problem!
Regards,
Simon

On Thu, Sep 16, 2010 at 6:01 PM, Simon Rit
<simon.rit at creatis.insa-lyon.fr> wrote:
> This is blending in the opengl sense and we had a lot of trouble to
> have a correct overlay for complementary colors (when you do vv
> image1.mhd --overlay image2.mhd).
> Normally, the blending is done using this formula:
>  color = alpha*color1 +(1-a) color2
> where alpha is between 0 and 1.
> Our workaround was to use the maximum of the two colors, but this is
> done by channel.
> If you manage to have another solution, we are very interested... but
> we don't see how to do it (at least with opengl). Maybe vtkBlendImages
> is a good solution?
> Let us know if you succeed!
> Simon
>
> PS: I forgot in my previous answer, you can now parse fusion from cmd
> line: vv image1.mhd --fusion image2.mhd
>
> On Thu, Sep 16, 2010 at 8:34 AM, Rajamani, Kumar (GE Global Research)
> <Kumar.Rajamani at ge.com> wrote:
>> Dear Simon, Joel
>>
>> While using the fusion feature, I realized that the slider
>> Changes the opacity of the background image (The combined image
>> Opacity is changed)
>>
>> I would like to have a functionality where the opacity slider
>> Changes the opacity of the overlay only
>> The background image should not be altered and should be always visible
>> The extent of overlay should only be altered by the fusion slider
>> Is this change possible ? Where could this change be  done ?
>>
>> I have tried vtkBlendImages but without success
>>
>> Warm Regards
>> Kumar
>>
>>
>>
>> Dear Kumar,
>> Wrt to the w/l of the fusion image, I totally agree and that's why the
>> guy that developed this functionality has added specific text boxes for
>> the w/l of the fusion image. If you open an image and add a fusion
>> image, go to the overlay tab and you can set the w/l of the overlay
>> image. Therefore, the w/l of the image and it's overlay are totally
>> independent.
>> Let me know if you feel that it's not enough, Simon
>>
>> On Mon, Sep 13, 2010 at 12:39 PM, Rajamani, Kumar (GE Global Research)
>> <Kumar.Rajamani at ge.com> wrote:
>>> Dear Simon
>>> Thanks for the update regarding the window/level functionality
>>>
>>> I will do a update and then check its functionality.
>>>
>>> There could also be potential issues if the W/L ranges of the base
>>> image And the W/L of the overlay image are very disparate This might
>>> require some grey level mapping before the overlays are done
>>>
>>> I would like to know your thoughts regarding this I shall test it with
>>
>>> this version and let you know my results
>>>
>>> Warm Regards
>>> Kumar
>>>
>>>
>>
>