http://www.diyphotography.net/easily-remove-people-images-simple-trick/
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https://compositing.wordpress.com/2010/09/13/premultiply-unpremultiply/
A premultiplied images is an image that has the RGB multiplied by the alpha channel.
This is usually for creating transparency when merging with a background (with the over operation). However problems occur when colour correcting the premultiplied image.
‘Unpremultiple’ is the process of dividing the alpha out of the image. Then the colour corrections can be done. After this stage, the alpha can then again be multiplied back in. This can often be done within the colour correction node itself, or manually.
http://nofilmschool.com/2015/04/nuke-powerful-node-based-compositing-software-now-available-everyone
https://www.youtube.com/watch?v=pPHHDBnV_V8
A self-organizing map (SOM) or self-organizing feature map (SOFM) is a type of artificial neural network (ANN) that is trained using unsupervised learning to produce a low-dimensional (typically two-dimensional), discretized representation of the input space of the training samples, called a map.
http://www.mat.ucsb.edu/~g.legrady/academic/courses/06w259/projs/cs/MAT259-paper.pdf
http://en.wikipedia.org/wiki/Self-organizing_map
You could be working with a commercial agency, a film director, a VFX studio or a games developer. You need to know that the person on the other end of the line is seeing exactly what you are showing them.
cineSync’s intuitive drawing tools allow anyone in the session to sketch right on top of the image.
You can circle or point to areas of interest, or paste “sticky note” text boxes, visible to everyone in the session.
You can also save out annotated reference frames – or even export the clip with the annotations burned in.
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