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Unfortunately, you have to use a switch statement. ex:

switch(img.depth())
{
    case CV_8U:
        std::for_each(img.begin<uchar>(), img.end<uchar>(), cleanPixel);
       break;
   case CV_16U:
       ....
    default:
        //Print error or whatever
}

You can also use the built-in forEach HERE, but it still requires a template argument, and therefore a switch statement.

Unfortunately, you have to use a if or a switch statement. ex:

switch(img.depth())
{
    case CV_8U:
        std::for_each(img.begin<uchar>(), img.end<uchar>(), cleanPixel);
       break;
   case CV_16U:
       ....
    default:
        //Print error or whatever
}

You can also use the built-in forEach HERE, but it still requires a template argument, and therefore an if/switch statement. However, it will parallellize your function, which is nice.

You can make a switch templated function for the whole processing chain and simply call that after the imread, giving you just one if/switch statement.