ok,
the only place i have found any reference to blend fields is in motion, i.e. stencil alpha is a type of blend field. it can be found by right clicking any object in motion.
the way i was seeing it used was this:
say you have a 15sec clip of someone running from rite to left pass a camera. pretty simple footage.
what i am trying to achieve is while that person is running across that screen in color i want to make one of the colors become a color burn that wipes across the screen over 6sec. so if the person has on red shoes, red hat and red gloves this color burn if it were done vertically from top to bottom would cause the hat to glow/burn the hat and as the burn moved downed the hat would go back to norm saturation as the glove began to burn and as the glove began to come out of its burn the shoes would begin into their burn and then go back to norm.
like a color wipe sorta.
does that help at all.
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