Video from b/w to color with the move of paintbrush in the video

[elia_lanksner]

Hello

i was filming a video with a kid with paintbrush in his hand

and i want to make the video start all b/w

then by the movement of the paintbrush in the video the video will start to be colorful

i know few ways to make the video b/w at start

but i dont know how can i make it colorful by movement

also i can use premiere or after effect... i'm not sure what is better for this

[excited_Genie16B8]

I think After Effects is definitely the better option here.

[shooternz · Accepted solution]

Are you trying to"paint in the color" with the paint brush movement?

You will need to create masks that follow the brush by using a rotoscope process - After Effects

A more simple generalised approach could be done with a transition such as a cross dissolve corresponding with the paint brush action.  PPro