White balance problem

Hi
I have some debayer sony images, and the WB coeffs confuse me. I find FRV will set the cam_mul to [1, 1, 1] different to Libraw. And when i convert raw to dng file, the value may be [1.73, 1.27, 1]. Can you explain why set to [1, 1, 1] for debayer images (just assume WB coeffs already applied). But for [1.73, 1.27, 1], the result looks not good.

Forums: 

It is hard to discuss

It is hard to discuss something without having files in question on hands.

Probably: your Sony (!) images are shot in Small/Medium (pseudo)RAW mode. This is YCC files (similar to lossless JPEGs), already processed and white balanced in camera.

-- Alex Tutubalin @LibRaw LLC