Magenta Work-around for Capture One workflow

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Hi,

 

I have been looking at these threads for quite a while.

May I have a naive question?

 

Why all the cameras (D70, M8 & R-D1) affected by the IR contamination have the IR signal overlaying the black colour with magenta tint?

 

These cameras come with different sensors, different logic boards, different firmware. Yet they all interpret the IR signal and display the signal in magenta colour, is it amazing?

 

Why not some of them displaying the IR in pink, some in red etc?

 

I really cannot image the defect present itself in such an "uniform" manner.

 

foolstop

Hi foolstop,

 

it is, why magenta is magenta! What seems to be a black (synthetic) cloth is not real black. The human eye is not able to see the real colour. Under some circumstances (against strong sun-light) and facing a synthetic fleece-cloth (for example) even our eye will (without any camera) remark these "magenta"-touch. Our eye (brain) is used to imagine "black", when "black" is intended. The technical "eye" of a camera is not able to process this interpolation. So it will be logical, that more-or-less the different sensors show magenta?

 

Manfred

[ho_co]

Why all the cameras (D70, M8 & R-D1) affected by the IR contamination have the IR signal overlaying the black colour with magenta tint? ... Why not some of them displaying the IR in pink, some in red etc?

I think the technical reason may be something like this: The infrared is at the red end of the visible spectrum, so if it reaches the sensor, it will be picked up primarily by the same pixels that pick up the visible red wavelengths. Since all the sensors work in basically the same way, they all respond in basically the same way. This is a naive answer that explains why they all look similar, but doesn't answer why that color is magenta; I think Manfred's response makes sense on that issue.

 

I hope someone on the forum will jump in and give a better explanation, but in the meantime, I hope this helps.

 

--HC