The color of the camera modified in IR

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16.03.2018 15:27:00
I use Sony NEX-5N with the removed IR filter. (to get colors close to the original, you can wind the filter in front of the lens, used this from Rocolax " UV-IR cut ").
Baer filters for matrices " as if " should not filter light longer than 700 nm, but in fact almost all sensors have a slightly different response there, so the picture in general does not get monochrome and demosics are needed.
If I shoot in a jeep and put the white balance on a white sheet, it usually turns out shades of gray and blue.
How can I process the color to get a richer color (of course, I have to subtract similar signals with noise amplification, but otherwise)? For example in RawTherapee.
think about how to make such a color conversion matrix type this:
X = R_raw
Y = B_raw - R_raw
Z = G_raw - B_raw - R_raw
But this RawTherapee do not understand anything. There are some sliders, and what they do, it's not clear.

Rava example: https: // yadi. sk / i / BcuiW5Hr3TSLKi
 

16.03.2018 18:47:00
Judging by the picture, I will assume that you have the IR720 filter bolted on. Accordingly, " color richer " it will not work. ))

16.03.2018 18:55:00
with a 720 nm filter will crawl all in the range from 720 nm to ~ 1050 nm approximately, this is even wider than in visible light.

16.03.2018 19:09:00
AND? It's all over the red. There the color will be the same as you draw it. I mean, to reality (by color) there will be no relation.

Here's an example, so you can colorize.


16.03.2018 19:29:00
IMHO it is easier to twist the IR-only filter (which cuts frequencies below 1000nm) and one click in Photoshop get the BF

http: // ixbt. photo /? id = photo: 1169143

16.03.2018 19:41:00
:
IMHO easier to wind IR-only filter (which cuts frequencies below 1000nm)
it if the goal was set to shoot at 1000 nm

:
And? It's all over the red. There the color will be the same as you draw it. I mean, to reality (by color) there will be no relation.
Well, you can call it a pseudocolor. Conditionally the goal is to divide this range by 700.. . 1100 nm into three equal bands.
Did you know the linear algebra was finding the orthogonal basis of the matrix 3x3? I want to do something like this here. . . .
:
Here's an example, so you can colorize.
did you twist the saturation slider to the right?

16.03.2018 20:06:00
this if the target was to be taken at 1000 nm
The thickest " IR effect " and it turns out if you cut off all visible light

16.03.2018 20:16:00
alliumnsk,

Yes, the saturation is increased by 7 (seven)%)) But this is not a defining parameter. About the false color.

What about the false color. Based on my experience and as far as I understand, for 720nm it is not very colorful.
I personally used the so-called full spectrum cameras with filters that work in the visible and near infrared ranges. That's when you can get colorful in all its glory. There are many such filters, including exotic ones. But good results (in postprocessing of course) can be obtained from simple cut-offs, such as IR580.

17.03.2018 11:42:00
Hmm, scoff. . . Okay, another question: what software can be used to build the color coverage diagram available in the file?

I would like to have a camera in which there would be for example a stack of filters and could be done for example with filters 700-800, 800-900, 900-100 immediately.

 
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The color of the camera modified in IR

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