原文地址为：
OpenCV 颜色空间转换参数CV_BGR2GRAY改变
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C++:
void cvtColor(InputArray src, OutputArray dst, int code, int dstCn=0 )
参数dstCn原来一直沿用CV_BGR2GRAY, CV_RGB2GRAY, CV_GRAY2BGR, CV_GRAY2RGB等格式，但最新几个版本的OpenCV已改为COLOR_BGR2GRAY类似形式，今天才看源代码imgproc.hpp才发现，但官方文档还没修改，如下图，如果程序中使用较新的版本OpenCV，采用CV_BGR2GRAY可能会一直出错。
新的OpenCV中imgproc.hpp的定义如下：
enum
{
COLOR_BGR2BGRA =0,
COLOR_RGB2RGBA =COLOR_BGR2BGRA,
COLOR_BGRA2BGR =1,
COLOR_RGBA2RGB =COLOR_BGRA2BGR,
COLOR_BGR2RGBA =2,
COLOR_RGB2BGRA =COLOR_BGR2RGBA,
COLOR_RGBA2BGR =3,
COLOR_BGRA2RGB =COLOR_RGBA2BGR,
COLOR_BGR2RGB =4,
COLOR_RGB2BGR =COLOR_BGR2RGB,
COLOR_BGRA2RGBA =5,
COLOR_RGBA2BGRA =COLOR_BGRA2RGBA,
COLOR_BGR2GRAY =6,
COLOR_RGB2GRAY =7,
COLOR_GRAY2BGR =8,
COLOR_GRAY2RGB =COLOR_GRAY2BGR,
COLOR_GRAY2BGRA =9,
COLOR_GRAY2RGBA =COLOR_GRAY2BGRA,
COLOR_BGRA2GRAY =10,
COLOR_RGBA2GRAY =11,
COLOR_BGR2BGR565 =12,
COLOR_RGB2BGR565 =13,
COLOR_BGR5652BGR =14,
COLOR_BGR5652RGB =15,
COLOR_BGRA2BGR565 =16,
COLOR_RGBA2BGR565 =17,
COLOR_BGR5652BGRA =18,
COLOR_BGR5652RGBA =19,
COLOR_GRAY2BGR565 =20,
COLOR_BGR5652GRAY =21,
COLOR_BGR2BGR555 =22,
COLOR_RGB2BGR555 =23,
COLOR_BGR5552BGR =24,
COLOR_BGR5552RGB =25,
COLOR_BGRA2BGR555 =26,
COLOR_RGBA2BGR555 =27,
COLOR_BGR5552BGRA =28,
COLOR_BGR5552RGBA =29,
COLOR_GRAY2BGR555 =30,
COLOR_BGR5552GRAY =31,
COLOR_BGR2XYZ =32,
COLOR_RGB2XYZ =33,
COLOR_XYZ2BGR =34,
COLOR_XYZ2RGB =35,
COLOR_BGR2YCrCb =36,
COLOR_RGB2YCrCb =37,
COLOR_YCrCb2BGR =38,
COLOR_YCrCb2RGB =39,
COLOR_BGR2HSV =40,
COLOR_RGB2HSV =41,
COLOR_BGR2Lab =44,
COLOR_RGB2Lab =45,
COLOR_BayerBG2BGR =46,
COLOR_BayerGB2BGR =47,
COLOR_BayerRG2BGR =48,
COLOR_BayerGR2BGR =49,
COLOR_BayerBG2RGB =COLOR_BayerRG2BGR,
COLOR_BayerGB2RGB =COLOR_BayerGR2BGR,
COLOR_BayerRG2RGB =COLOR_BayerBG2BGR,
COLOR_BayerGR2RGB =COLOR_BayerGB2BGR,
COLOR_BGR2Luv =50,
COLOR_RGB2Luv =51,
COLOR_BGR2HLS =52,
COLOR_RGB2HLS =53,
COLOR_HSV2BGR =54,
COLOR_HSV2RGB =55,
COLOR_Lab2BGR =56,
COLOR_Lab2RGB =57,
COLOR_Luv2BGR =58,
COLOR_Luv2RGB =59,
COLOR_HLS2BGR =60,
COLOR_HLS2RGB =61,
COLOR_BayerBG2BGR_VNG =62,
COLOR_BayerGB2BGR_VNG =63,
COLOR_BayerRG2BGR_VNG =64,
COLOR_BayerGR2BGR_VNG =65,
COLOR_BayerBG2RGB_VNG =COLOR_BayerRG2BGR_VNG,
COLOR_BayerGB2RGB_VNG =COLOR_BayerGR2BGR_VNG,
COLOR_BayerRG2RGB_VNG =COLOR_BayerBG2BGR_VNG,
COLOR_BayerGR2RGB_VNG =COLOR_BayerGB2BGR_VNG,
COLOR_BGR2HSV_FULL = 66,
COLOR_RGB2HSV_FULL = 67,
COLOR_BGR2HLS_FULL = 68,
COLOR_RGB2HLS_FULL = 69,
COLOR_HSV2BGR_FULL = 70,
COLOR_HSV2RGB_FULL = 71,
COLOR_HLS2BGR_FULL = 72,
COLOR_HLS2RGB_FULL = 73,
COLOR_LBGR2Lab = 74,
COLOR_LRGB2Lab = 75,
COLOR_LBGR2Luv = 76,
COLOR_LRGB2Luv = 77,
COLOR_Lab2LBGR = 78,
COLOR_Lab2LRGB = 79,
COLOR_Luv2LBGR = 80,
COLOR_Luv2LRGB = 81,
COLOR_BGR2YUV = 82,
COLOR_RGB2YUV = 83,
COLOR_YUV2BGR = 84,
COLOR_YUV2RGB = 85,
COLOR_BayerBG2GRAY = 86,
COLOR_BayerGB2GRAY = 87,
COLOR_BayerRG2GRAY = 88,
COLOR_BayerGR2GRAY = 89,
//YUV 4:2:0 formats family
COLOR_YUV2RGB_NV12 = 90,
COLOR_YUV2BGR_NV12 = 91,
COLOR_YUV2RGB_NV21 = 92,
COLOR_YUV2BGR_NV21 = 93,
COLOR_YUV420sp2RGB = COLOR_YUV2RGB_NV21,
COLOR_YUV420sp2BGR = COLOR_YUV2BGR_NV21,
COLOR_YUV2RGBA_NV12 = 94,
COLOR_YUV2BGRA_NV12 = 95,
COLOR_YUV2RGBA_NV21 = 96,
COLOR_YUV2BGRA_NV21 = 97,
COLOR_YUV420sp2RGBA = COLOR_YUV2RGBA_NV21,
COLOR_YUV420sp2BGRA = COLOR_YUV2BGRA_NV21,
COLOR_YUV2RGB_YV12 = 98,
COLOR_YUV2BGR_YV12 = 99,
COLOR_YUV2RGB_IYUV = 100,
COLOR_YUV2BGR_IYUV = 101,
COLOR_YUV2RGB_I420 = COLOR_YUV2RGB_IYUV,
COLOR_YUV2BGR_I420 = COLOR_YUV2BGR_IYUV,
COLOR_YUV420p2RGB = COLOR_YUV2RGB_YV12,
COLOR_YUV420p2BGR = COLOR_YUV2BGR_YV12,
COLOR_YUV2RGBA_YV12 = 102,
COLOR_YUV2BGRA_YV12 = 103,
COLOR_YUV2RGBA_IYUV = 104,
COLOR_YUV2BGRA_IYUV = 105,
COLOR_YUV2RGBA_I420 = COLOR_YUV2RGBA_IYUV,
COLOR_YUV2BGRA_I420 = COLOR_YUV2BGRA_IYUV,
COLOR_YUV420p2RGBA = COLOR_YUV2RGBA_YV12,
COLOR_YUV420p2BGRA = COLOR_YUV2BGRA_YV12,
COLOR_YUV2GRAY_420 = 106,
COLOR_YUV2GRAY_NV21 = COLOR_YUV2GRAY_420,
COLOR_YUV2GRAY_NV12 = COLOR_YUV2GRAY_420,
COLOR_YUV2GRAY_YV12 = COLOR_YUV2GRAY_420,
COLOR_YUV2GRAY_IYUV = COLOR_YUV2GRAY_420,
COLOR_YUV2GRAY_I420 = COLOR_YUV2GRAY_420,
COLOR_YUV420sp2GRAY = COLOR_YUV2GRAY_420,
COLOR_YUV420p2GRAY = COLOR_YUV2GRAY_420,
//YUV 4:2:2 formats family
COLOR_YUV2RGB_UYVY = 107,
COLOR_YUV2BGR_UYVY = 108,
//COLOR_YUV2RGB_VYUY = 109,
//COLOR_YUV2BGR_VYUY = 110,
COLOR_YUV2RGB_Y422 = COLOR_YUV2RGB_UYVY,
COLOR_YUV2BGR_Y422 = COLOR_YUV2BGR_UYVY,
COLOR_YUV2RGB_UYNV = COLOR_YUV2RGB_UYVY,
COLOR_YUV2BGR_UYNV = COLOR_YUV2BGR_UYVY,
COLOR_YUV2RGBA_UYVY = 111,
COLOR_YUV2BGRA_UYVY = 112,
//COLOR_YUV2RGBA_VYUY = 113,
//COLOR_YUV2BGRA_VYUY = 114,
COLOR_YUV2RGBA_Y422 = COLOR_YUV2RGBA_UYVY,
COLOR_YUV2BGRA_Y422 = COLOR_YUV2BGRA_UYVY,
COLOR_YUV2RGBA_UYNV = COLOR_YUV2RGBA_UYVY,
COLOR_YUV2BGRA_UYNV = COLOR_YUV2BGRA_UYVY,
COLOR_YUV2RGB_YUY2 = 115,
COLOR_YUV2BGR_YUY2 = 116,
COLOR_YUV2RGB_YVYU = 117,
COLOR_YUV2BGR_YVYU = 118,
COLOR_YUV2RGB_YUYV = COLOR_YUV2RGB_YUY2,
COLOR_YUV2BGR_YUYV = COLOR_YUV2BGR_YUY2,
COLOR_YUV2RGB_YUNV = COLOR_YUV2RGB_YUY2,
COLOR_YUV2BGR_YUNV = COLOR_YUV2BGR_YUY2,
COLOR_YUV2RGBA_YUY2 = 119,
COLOR_YUV2BGRA_YUY2 = 120,
COLOR_YUV2RGBA_YVYU = 121,
COLOR_YUV2BGRA_YVYU = 122,
COLOR_YUV2RGBA_YUYV = COLOR_YUV2RGBA_YUY2,
COLOR_YUV2BGRA_YUYV = COLOR_YUV2BGRA_YUY2,
COLOR_YUV2RGBA_YUNV = COLOR_YUV2RGBA_YUY2,
COLOR_YUV2BGRA_YUNV = COLOR_YUV2BGRA_YUY2,
COLOR_YUV2GRAY_UYVY = 123,
COLOR_YUV2GRAY_YUY2 = 124,
//COLOR_YUV2GRAY_VYUY = COLOR_YUV2GRAY_UYVY,
COLOR_YUV2GRAY_Y422 = COLOR_YUV2GRAY_UYVY,
COLOR_YUV2GRAY_UYNV = COLOR_YUV2GRAY_UYVY,
COLOR_YUV2GRAY_YVYU = COLOR_YUV2GRAY_YUY2,
COLOR_YUV2GRAY_YUYV = COLOR_YUV2GRAY_YUY2,
COLOR_YUV2GRAY_YUNV = COLOR_YUV2GRAY_YUY2,
// alpha premultiplication
COLOR_RGBA2mRGBA = 125,
COLOR_mRGBA2RGBA = 126,
COLOR_RGB2YUV_I420 = 127,
COLOR_BGR2YUV_I420 = 128,
COLOR_RGB2YUV_IYUV = COLOR_RGB2YUV_I420,
COLOR_BGR2YUV_IYUV = COLOR_BGR2YUV_I420,
COLOR_RGBA2YUV_I420 = 129,
COLOR_BGRA2YUV_I420 = 130,
COLOR_RGBA2YUV_IYUV = COLOR_RGBA2YUV_I420,
COLOR_BGRA2YUV_IYUV = COLOR_BGRA2YUV_I420,
COLOR_RGB2YUV_YV12 = 131,
COLOR_BGR2YUV_YV12 = 132,
COLOR_RGBA2YUV_YV12 = 133,
COLOR_BGRA2YUV_YV12 = 134,
COLOR_COLORCVT_MAX = 135
};
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