Using Color Calibration for B&W Infrared Contrast?

Software darktable
1

Does anyone have any suggestions for using the color calibration module to alter the contrast in infrared pics converted to black and white? Say to darken skies or tone down highlights. Or are the files just predominantly in the red channel? I managed to use the brightness sliders to modulate the contrast in the following 720nm pics, mostly bringing back detail into the bright leaves in the last one but it was a bit random pushing stuff around. Thanks

20230622_0080_01
20230622_0080_013666×5494 1.28 MB

20230622_0094
20230622_00943185×4773 1.25 MB

20230622_0104
20230622_01043350×5021 2.2 MB

1 Like
2

This link might prove useful. After about 800nm the colour filter array is mostly transparent to the light and all three channels respond equally (presumably why 800nm+ is commonly used for B&W images). Below that point you get a higher response in the red channel.

1 Like
3

Thanks. That’s a handy illustration