How to Convert to ARGB format

Question

I am trying to convert a RGB image to ARGB format. Is there any way to this in openCV? As far as I know, it is possible to convert the image to RGBA, but am not sure about ARGB.

This is what I am doing currently:

        cv::Mat argb(myImage.rows, myImage.cols, CV_8UC4);
        cv::Mat alpha(myImage.rows, myImage.cols, CV_8UC1);
        cv::Mat in[] = { myImage, alpha };
        int from_to[] = { 0,1,  1,2,  2,3,  3,0 };
        cv::mixChannels( in, 2, &argb, 1, from_to, 4 );

myImage is in 8uc3 format, which is my input image. But I need to change the format to ARGB for another application.

Answer 1

As far as i know cvtColor function doesn't provide such convertion, so you need to write it on your own - look at the source code of cvtColor function, your convertion will be quite similar to CV_BGR2RGB - you just need to switch first and last channel.