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I'm leaning towards a wording bug in the doc because it makes sense to return 3 channels if your input is 3 channels.

Mat img = Mat(1,1,CV_8UC3);

img.at<Vec3b>(0)[0] = 0;
img.at<Vec3b>(0)[1] = 100;
img.at<Vec3b>(0)[2] = 200;

cout << (img != 0) << endl;

gives

[0, 255, 255]