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Hi all: In opencv doucument , the result of using substract link text are all positive (if image range is 0~255). How to do i can get negative value when src1-src2 where src2<src1 ?????<="" p="">

Hi all: In opencv doucument , the result of using substract link text are all positive (if image range is 0~255). How to do i can get negative value when src1-src2 where src2<src1 ?????<="" p=""> src2 less than src1 ????? if i do not want use:

for(int i=0;i<src1.rows;i++)
for(int j=0;src1.cols;j++)
dst.at<uchar>(i,j)=src1.at<uchar>(i,j)-src2<uchar>(i.j)

Hi all: In opencv doucument , the result of using substract link text are all positive (if image range is 0~255). How to do i can get negative value when src1-src2 where src2 less than src1 ????? if i do not want use:?????

for(int i=0;i<src1.rows;i++)
for(int j=0;src1.cols;j++)
dst.at<uchar>(i,j)=src1.at<uchar>(i,j)-src2<uchar>(i.j)

Hi all: In opencv doucument , the result of using substract link text are all positive (if image range is 0~255). How to do that i can get negative value when src1-src2 where src2 less larger than src1 ??????