Resize image OpenCV

Question

If I have an image called inImg and an image named outImg how can I resize outImg so that it is 75% the size of inImg?

Answer 1

If you want 75% along each axis, you should be able to use cv::resize to do:

cv::resize(inImg, outImg, cv::Size(), 0.75, 0.75);

Answer 2

Use cv::resize. Following code will resize outImg to 0.75 times the dimensions of inImg with CV_INTER_LINEAR type of interpolation.

cv::resize(outImg, outImg, cv::Size(inImg.cols * 0.75,inImg.rows * 0.75), 0, 0, CV_INTER_LINEAR);

4th and 5th argument should be left 0 or not assigned to take 3rd argument as size otherwise it will scale according to 4th and 5th arguments. (OpenCV3 resize)