Tried to resize the image but got an error?

Question

Hi,

I'm using the following code to resize this attach image but the output always changes color.

cv::Mat dat= cv::imread(path, IMREAD_UNCHANGED);

cv::Mat dst;

cv::resize(dat, dst, cv::Size(), 0.6, 0.6, INTER_AREA);

cv::imwrite(path, dst);

I tried changing many different options with no success besides the image quality may decrease.

How I can fix this?