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I want to calculate the shutter speed and ISO of Picamera using the brightness information of the previous image I captured.

I have already calculated the brightness of the previous image but I am stuck at how to use this info to calculate the ISO and shutter speed so that I get all my images (day+night) of the same brightness. For instance, I want the optimum image brightness to be 130 in all cases. I used the following formula to calculate the brightness;

sqrt(0.299*R^2+0.587*G^2+0.114*B^2)

I want a formula to calculate the ISO and SS based on brightness information.

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