Fixed bug: char blocks must be read as grayscale images.
Fixed bug: char blocks must be read as grayscale images.

micooz/EasyPR,feiyungu/EasyPR,liuruoze/EasyPR,liuruoze/EasyPR,wrestle/EasyPR,micooz/EasyPR,liuruoze/EasyPR,micooz/EasyPR,tingjianlau/EasyPR,nuan-nuan/EasyPR,micooz/EasyPR,wrestle/EasyPR,wrestle/EasyPR,feiyungu/EasyPR,liuruoze/EasyPR,wrestle/EasyPR,feiyungu/EasyPR,tingjianlau/EasyPR,tingjianlau/EasyPR,nuan-nuan/EasyPR,tingjianlau/EasyPR,feiyungu/EasyPR