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<div>The actual blending operation in IceT is pix1 + pix2*(1-alpha1). Thus, I think your idea will work if you set all the alpha values to 0.</div>
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<div>-Ken</div>
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<span style="font-weight:bold">From: </span><Biddiscombe>, "John A." <<a href="mailto:biddisco@cscs.ch">biddisco@cscs.ch</a>><br>
<span style="font-weight:bold">Date: </span>Wednesday, July 30, 2014 12:04 PM<br>
<span style="font-weight:bold">To: </span>Kenneth Moreland <<a href="mailto:kmorel@sandia.gov">kmorel@sandia.gov</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:paraview-developers@paraview.org">paraview-developers@paraview.org</a>" <<a href="mailto:paraview-developers@paraview.org">paraview-developers@paraview.org</a>>, Dykes Timothy <<a href="mailto:dykes@cscs.ch">dykes@cscs.ch</a>><br>
<span style="font-weight:bold">Subject: </span>[EXTERNAL] RE: [Paraview-developers] IceT compositing in paraview<br>
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<span style="color: rgb(31, 73, 125); ">new idea :<o:p></o:p></span></p>
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<span style="color: rgb(31, 73, 125); ">What about this : the blend operator is something like pix1*alpha + pix2*(1-alpha). if order was not important, would it be doable for us to premultiply each pixel by N(=numranks), set alpha for each pixel to 0.5 and
then we’d get 1/N contributions all equally weighted and scaled by N to bring back the original image? I could reuse the zoltan partiioning stuff I worked on before to do an efficient redistribution and then use a standard blend mode and bypass the paraview
data redistribution using our kdtree from zoltan. This ought tow work. I’ll give it a try. Mind you if the blend operation is different, then I may need a new plan...<o:p></o:p></span></p>
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