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I don't understand really well about this Back light concept,from the 3 points light. I mean its supose to "cut" the person from the image, but in my vision the back light its just a light behind the character, i do not see the difference with or without the back light...

can you guys help me or give me tips about this light, and how does this work??
the light in the back is to be offset a little so it shows up on the rim of the subject, rather than directly behind

the light on the rim adds an outline to the contour

guy i knew from /p/ uses it a lot in his nude photography https://www.instagram.com/michaelrodriguezphoto/

that link is nsfw btw
This. Or, if the light is directly behind the subject, it can give a kick of light to the hair.
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It's kinda silly imo too and I was never a huge fan of it but just think of it the way it's called as "rim lighting". You set up your light sources so that the falloff illuminates the edges of your object/subject. It's supposed to give more definition, making it easier to focus on.

Not sure who out there is having so much trouble focusing of what is dead-on front and center but whatever.

If that rim wasn't there the shirt would blend with the background
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>i do not see the difference with or without the back light

>It's kinda silly imo
In a fully lit scene, yes is silly to get so anal about it.

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