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TDA4VM: AE Target brightness

Part Number: TDA4VM

Hi TI Experts,

I was going through the AE algorithm under "imaging/algos/ae/" and "imaging/kernels/arm/" folders.

In the config file for AR0233(iss_sensor_ar0233.c)  the target brightness value is set to 45.

Q1) what is the range of this value ? if it is in the "0 to 255"range then 45 may be very dark value ( considering 0 as black and 255 as white). So why 45(dark value)?

Q2) Also in the AE algorithm(TI_aaa_ae.c ) we are calculating the current luminous value(Y_cur) .What is the range of this value?

Thank you.