OpenCV how to imwrite a RGB image

Question

How do I write a RGB image with the function cv::imwrite() ? So far all my attempts lead into writing a BGR image instead.

My matrix object is a cv::Mat .

Answer 1

The cv::imwrite() function correctly writes an image file if the input cv::Mat is in BGR order (which is the case if you let OpenCV create it). If you created the image by yourself, you have to convert the color ordering before, for example by calling as suggested by bamboove cv::cvtColor(in, out, CV_RGB2BGR); if you created an RGB image.

(Pay attention to the color conversion code, it's slightly different from bamboon's.)