Hello, my name is Cristofer writing from Chile.
I'm interested in learning more about stress in plants.
Buy Red and Blue filter, and the mount in my SJ4000.
Take the first images but not much sunlight :(
What we still do not understand is that bands have my camera now that you place red filter is NGB or NRGB? and capture nm spectrum in that filter?
Stay tuned to comment.
Thank you so much.
Yes sunlight is important. The light illuminating the plant should have about the same proportion of visible:NIR as sunlight or the results will be hard to interpret. Check to see what options the camera has for white balance settings.
I reviewed my camera has 4 options for white balance, select the option 'sun' and these are the results
Did you remove the camera's IR block filter before you installed the red filter?
If so, the blue channel in your photos should be a good NIR photo. It sort of looks like it is, but I'm not sure.
The red channel in your photos should be mixed NIR and red and could be used to represent visible light in computations of NDVI. But the red channel in your photos is overexposed so it does not have very good information in it.
The standard protocol is to set a custom white balance that exaggerates the brightness of the blue channel in every photo. Your camera apparently does not allow that. So it will be difficult to take photos that can be converted directly to NDVI or other plant health indices.
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If I removed the fitro for IR camera lens
yesterday was a very sunny day in Santiago de Chile, take the occasion and take photographs changing the white balance.
These are the results, I built histograms.
Balance = Auto
Balance = Sun
Balance = Clouds
Balance = Tungsten
Balance = Fruoro
Sorry, but my English is not very good