Have you ever tried the code offered by Dimitar?
GridViewDataRowInfo row = radMultiColumnComboBox1.SelectedItem as GridViewDataRowInfo;
Image img = (Image)row.Cells["image"].Value;
Did it work well? Or you can google it and select some manual image converters which can be customized by users according to our own favors to help you convert images. Remember to check its free trial package first if possible. I hope you success. Good luck.