There's a ton of stuff that can be done by treating the stack of source imagery as a movie brush for building photo mosaics. We'll get more heavily into that later but i thought i'd post a really simple example. I modified the 3.5 Collection Graffiti category to use the original portrait virus images. I used a different brush load image processing algorithm for the colorization, the meanshift1 algorithm seems to have some issues with the dark areas of the siggraph 2010 portraits. So i'll look into that, not sure if it's a bug or an artifact associated with the compression i used for the movie brush.
I think movie background textures may end up being more effective for this set of source imagery since you can use the source portraits at full resolution in the generated texturing to get at all of the detail of the original paint stroke texturing. I had to size the portraits down so small to make a source movie brush from the original portrait stack that you lose most of the paint effects in the individual portraits that make up the mosiac.
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