The CubePlusPlus\challenge\make_preview.py make the photo a little white

[RebornForPower]

Thanks for sharing your work~ I am the freshman and want to learn the color constancy. But now I don't know how to generate the original photo by the gt.csv and *.png. I have tried to restore it but get the wrong result. My result is a little white than the original photo. （The photo is from the simplecube++ and the code is reference from the CubePlusPlus\challenge\make_preview.py）

This is my result：

but the original photo is：

Thanks~