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I tested both samples now.

I tested both samples now.
They work both, but have the same heavy yellow shift when opend in PS. (It's an old Canon 7D cr2 by the way.) The exported thumbnail had not.

And, even with the heavy yellow shift, the values do not match... In 8 and 16 bit mode....

The first pixel of the ppm file in PS has RGB(54, 64, 14).
The first pixel of my xls has
RGBG2(542,1052,418,874) from .imgdata.image[pos][], or
RGB(22,34,18) from image->data[]