Using OpenCV imread to convert RGB image into grayscale image!_opencv base and use

In general, we use Cvtcolor to convert an image to a grayscale image, but we can actually convert the image to grayscale when we read it.

Very simple operation, just want to imread the second parameter to 0 can be

As in the following code:

Cv::mat srcimage = Cv::imread ("Lakewater.jpg", 0);

The official description of the second parameter is as follows:

>0 return a 3-channel color image
=0 return a grayscale image
<0 return the loaded image. Note this in the "Current implementation" alpha channel, if any, which is stripped from the output image. For example, a 4-channel RGBA the image is loaded as RGB if Flags\ge0.
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