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Asked: 2026-05-28T20:27:28+00:00

I’m working with QT and OpenCV, I have this square that I need to

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I’m working with QT and OpenCV, I have this square that I need to extract but I need to use conversion from RGB to one channel (RED basically). Any advice will be more than welcome, please feel free to advice which functions to use. Thanks in advance.

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  1. Editorial Team

    I think cvSplit is what you’re looking for (docs). You can use it, for example, to split RGB into R, G, and B:

    /* assuming src is your source image */
CvSize s = cvSize(src->width, src->height);
int d = src->depth;
IplImage* R = cvCreateImage(s, d, 1);
IplImage* G = cvCreateImage(s, d, 1);
IplImage* B = cvCreateImage(s, d, 1);
cvSplit(src, R, G, B, null);

    Note you’ll need to be careful about the ordering; make sure that the original image is actually ordered as R, G, B (there’s a decent chance it’s B, G, R).

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