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Here src is an instance of Mat and it's type is CV_8UC4.I want to use src as first parameter of watershed:

public static void watershed(Mat image, Mat markers)

In about first parameter of watershed,Docs say:

Parameters:
image - Input 8-bit 3-channel image.

So I have to convert src from CV_8UC4 to CV_8UC3.I used this to convert src type:

src.convertTo(src, CvType.CV_8UC3);

But after that,when I debug code,type of src is CV_8UC4 yet and no CV_8UC3.Did I do any thing wrong?And how I can convert it's type?