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Unexpected behaviour of adjust_bl()

00000462 2019/07/01 12:02:48.502 041868 0000aab4 +int __thiscall CRawDecod::LoadRawFile(class CMemoryBitmap *,class CDSSProgress *,int)(rawutils.cpp:661)
00000463 2019/07/01 12:02:48.509 041868 0000aab4 +int __thiscall CRawDecod::IsRawFile(void)(rawutils.cpp:1134)
00000464 2019/07/01 12:02:48.517 041868 0000aab4 -int __thiscall CRawDecod::IsRawFile(void)
00000465 2019/07/01 12:02:48.542 041868 0000aab4 >Calling LibRaw::unpack()
00000466 2019/07/01 12:02:50.793 041868 0000aab4 >Processing Bayer pattern raw image data
00000467 2019/07/01 12:02:50.818 041868 0000aab4 >Extracting real image data (excluding the frame) from RawData.raw_image
00000468 2019/07/01 12:02:50.843 041868 0000aab4 >Before adjust_bl() C.black = 2048.
00000469 2019/07/01 12:02:50.854 041868 0000aab4 >First 10 C.cblack elements
00000469 2019/07/01 12:02:50.854 041868 0000aab4 > 0, 0, 0, 0
00000469 2019/07/01 12:02:50.854 041868 0000aab4 > 0, 0
00000469 2019/07/01 12:02:50.854 041868 0000aab4 > 0, 0, 0, 0
00000470 2019/07/01 12:02:50.866 041868 0000aab4 >Subtracting black level of C.black = 0 from raw_image data.
00000471 2019/07/01 12:02:50.878 041868 0000aab4 >First 10 C.cblack elements
00000471 2019/07/01 12:02:50.878 041868 0000aab4 > 0, 0, 0, 0
00000471 2019/07/01 12:02:50.878 041868 0000aab4 > 0, 0
00000471 2019/07/01 12:02:50.878 041868 0000aab4 > 0, 0, 0, 0
00000472 2019/07/01 12:02:50.900 041868 0000aab4 >Using Daylight White Balance.

Note that C.Black was set to zero when adjust_bl() was called which I don't think is correct.

Please could you clarify this for me?

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