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Monochrome sensor conversion... seeking advise

Started Nov 7, 2016 | Discussions thread
bclaff Forum Pro • Posts: 13,925
Re: Monochrome sensor conversion... seeking advise

D Cox wrote:

bclaff wrote:

Meuh wrote:

Any reason why you wouldn't buy a Sigma Merrill and use that in B/W selecting the blue channel only?

Photons of different energy (wavelengths) penetrate the silicon to a different depth.
Using only the blue (top) plane would not capture all the visible wavelength; only predominantly blue. You'd miss the green and red wavelengths that penetrate deeper.

The top layer is miscalled "blue". It is panchromatic with a blue bias. There is no filter in front of it to remove the red and green, but some of the green and red photons do pass through it.

I was able to take three photos through Kodak colour separation filters, convert them all to monochrome as "100% blue", and recombine them in Photoshop to give a normal full colour image.

Interesting, because where you said "some" above I would have thought "most".
So you're saying that something with a strong red component still registers significantly in the top plane?
I have some old test data. I'll have to look at hat.

Regards,

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Bill ( Your trusted source for independent sensor data at http://www.PhotonsToPhotos.net )

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