Hi Jim Thank you for your answer. We tried using larger values of Black Target from your recommendation. It works but with some shades. We found out that Black calibration works properly when our sensor board has warmed up. Maybe CCD sensor is needed to warm up for correct work. When board is cold black calibration does not work ideally. But when board is warm black calibration works perfectly even with lower values of Black Target. P.S. Black calibration works better with ADAC scalling = 1/2 (Page 2, register 2).
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