OpenCV version: 3.1.0

Example code:

#include "opencv2/imgproc.hpp"
#include "opencv2/core/ocl.hpp"
int main() {
    cv::UMat m(10, 10, CV_8UC3);
    cv::ocl::Image2D i2d(m);
    return 0;
}

gives:

OpenCV Error: Unknown error code -220 (Image format is not supported) in init, file /build/opencv/src/opencv-3.1.0/modules/core/src/ocl.cpp, line 5917
terminate called after throwing an instance of 'cv::Exception'
  what():  /build/opencv/src/opencv-3.1.0/modules/core/src/ocl.cpp:5917: error: (-220) Image format is not supported in function init

I glanced at the code. Image2D::Impl::getImageFormat in modules/core/src/ocl.cpp writes:

static const int channelOrders[] = { -1, CL_R, CL_RG, -1, CL_RGBA };

If I'm not wrong, 3-channel images are not supported by design. But It seems strange not to support common RGB image as there is CL_RGB channel order in OpenCL.

I think commit da5b316 brought in the change, but commit log didn't give much info. Any reason why?