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midzki said:
if paper type is different, color range is different not just brightness but RGB balance, too.


my scanner is adjusted #1 type paper, but when I scan #2 type paper, they got strange hue even though actual paper has same colors in my eyes >_>

this result tells you why IT8 target failed, and why scans need naked eyes to adjust colors.
Sure. first, your scanner detector's response is not quite the same as your eye's; second, the emission spectrum of your room light is quite different from your scanner's. So it's quite normal that real work results stray from target calibration results...

Making a target with EXACTLY the same paper and ink used by the book you are going scan maybe will make things better, but i don't think it practical...