I have two regions of interest: red (~665nm) and near-infrared / far-red (~720-750nm). (possibly more but I'd like to see what is possible first)
The ratio of the absorbance values for red/far red is important in my work. Think types of vegetation, that sort of thing. I'd like to distinguish between things that absorb in the red (with a bit of far-red) and things that absorb in the red (with more far-red)
I know it is possible to highlight my samples of interest using a hyperspectral camera, by focusing on two channels. However, a hyperspectral camera is rather expensive. I'd like to see if a cheap hack for fieldwork is possible.
My current (very limited) knowledge:
-smartphone cameras may lack a 'hot filter', enabling them to sense near-infrared light
-an external filter may be used to remove unwanted wavelengths (e.g. https://petapixel.com/2019/08/22/how-i-shoot-infrared-photography-with-a-smartphone/)
-it's important to take RAW photos (with all the data). Some phones like the A51 may not have that by default, but require additional apps (e.g. Lightroom) for that.
Where I am currently stuck: -I assume near-infrared pixels will be labeled in most software as 'red'. Would there be any app which enables me to separate (even false-color differently) shorter-wavelength red from longer-wavelength red? I am not quite sure how cameras work and whether this is is even possible from a hardware perspective, never mind software.
Thank you for your time!