1Dx - black line on edge of subject?

Has anybody experienced a similar issue with their 1Dx that I did last week where there's a black line running along the edge of, for example, the model's arm or face? Below is a 100% crop of what I'm referring to.

Is there such a thing as inverted CA?

Judging from the pinlight it looks like you used on camera flash and, quite honestly, it looks to me like it could be a flash shadow from an (almost) on-axis flash. Something like this, but even closer to the lens, or at much further distance from the subject than I was....

you can get this from a dark background moreso if the subject is close to it, i m just about sure its not the camera.
do you get this with a light background ?
Rob.

tdodd wrote in post #16176129
Judging from the pinlight it looks like you used on camera flash and, quite honestly, it looks to me like it could be a flash shadow from an (almost) on-axis flash. Something like this, but even closer to the lens, or at much further distance from the subject than I was....

If it were a shadow from a flash (or light source) then why does it not continue on down the whole length of the arm instead of stopping where it did?

BTW, I was not using a flash. The picture was light by a flashlight held by another person who was standing away from me and not directly behind me.

i think if we saw the full picture that would give us some more reference

GyRob wrote in post #16176157
you can get this from a dark background moreso if the subject is close to it, i m just about sure its not the camera.
do you get this with a light background ?
Rob.

The subject was several feet away from the subject, maybe 5 or 6 feet, which is not close at all.

Try a test shot with flat, even lighting lighting, such as bounced flash within a room or just plain ambient, but avoid hard, direct light which casts shadows of any kind.

PacAce wrote in post #16176311
The subject was several feet away from the subject, maybe 5 or 6 feet, which is not close at all.

thats far enough away so not what i thought it was.
Rob.

What are you doing in the processing? Sharpening, black levels, contrast?? I've seen lines like this appear with over sharpening when the blacks or contrast have been bumped up.