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TDA4VM: raw is overexposeure,but YUV is normal

Part Number: TDA4VM

Grab a RAW image in the light box.  RAW image has been overexposed, but the image after VPAC processing looks normal.

The image on the left is a RAW ,the left on the right is a YUV.

 

         

rar is raw

2500.rar

sensor mode:

HDR4 ,The data is compressed from 24 bits to 12 bits on the sensor.

compand knee point:

this is decompand's txt.

ox03f_lut_wdr_overall_pwl_global.txt
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65471,

     Please help to analyze the reason,thanks~