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I am new to image processing. I am applying NDVI index on an image of an agricultural farm taken by drone. But the formula (NIR-Red)/(NIR+Red) is giving me wrong output (here instead of NIR we are using the blue channel). Then I came to know that the image I am using is taken by camera with NIR sensors. Would the formula differ from normal formula of NDVI?

I am new to image processing. I am applying NDVI index on an image of an agricultural farm taken by drone. But the formula (NIR-Red)/(NIR+Red) is giving me wrong output (here instead of NIR we are using the blue channel). Then I came to know that the image I am using is taken by camera with NIR sensors. Would the formula differ from normal formula of NDVI?