Q on long exposure photos; how the photo is recorded- the process

hi,

i've done long exposure photos before , know how them etc... have question how photo recorded , process camera uses.

lets try explain thoughts;
taking long exposure , walks across photo black tshirt on, followed person white tshirt on. these opposite colours cancel each other out bit? same said colours.

reason i'm asking because i'm trying show movement through space accurate possible if colours being cancelled out affect results?

thanks!

 

the colours won't cancel each other out cause person become invisible, pixels blend/average, theoretically become shade of gray - way average biased depends on light intensity of subjects (and black shirt absorb lot of light).

glowing (literally) green shirt have more prominence on dim red shirt when cross paths in exposure.

 

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