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your maths is broken, cv::Range(img1.cols, img2.cols) is 0 if img1.cols == img2.cols.

you probably wanted something like: cv::Range(img1.cols, collageImg.cols)

your maths is broken, cv::Range(img1.cols, img2.cols) is 0empty, if img1.cols == img2.cols.

you probably wanted something like: cv::Range(img1.cols, collageImg.cols)

your maths is broken, error,

cv::Range(img1.cols, img2.cols) is empty, if img1.cols == img2.cols.

you probably wanted something like: cv::Range(img1.cols, collageImg.cols)

maths error,

cv::Range(img1.cols, img2.cols)img2.cols)
 

cv::Range(img1.cols, collageImg.cols)collageImg.cols)