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Its pretty simple actually. Check the example

cv::Vec3b a;
a[0] = a[1] = a[2] = 2;

cout << a << endl;

a = 2 * a;

cout << a << endl;

Output:

[2, 2, 2]
[4, 4, 4]

Its pretty simple actually. Check the example

cv::Vec3b cv::Vec3i a;
a[0] = a[1] = a[2] = 2;

cout << a << endl;

a = 2 * a;

cout << a << endl;

Output:

[2, 2, 2]
[4, 4, 4]