這篇文章主要講解了“C++中怎么使用cvtColor實現顏色轉換”，文中的講解內容簡單清晰，易于學習與理解，下面請大家跟著小編的思路慢慢深入，一起來研究和學習“C++中怎么使用cvtColor實現顏色轉換”吧！

前言

在我們讀取圖像時通常會用到imread（）函數，里面flags可以決定通道數，來得到我們想要的圖像，比如：

-1 按解碼得到的方式讀入圖像；

0 單通道 灰度圖；

1 三通道 彩色；

當我們想要其他類型的圖像時，這種方法就有一些局限性了，所以我們有必要了解cvtColor 這是一種顏色空間轉換函數。

源碼

voidcvtColor(InputArraysrc,OutputArraydst,intcode,intdstCn=0);
src輸入圖像
dst輸出圖像
code代碼顏色空間轉換代碼
dstCn目標圖像中的信道數;如果該參數為0，則通道的數量自動從SRC和code派生。

可以支持RGB HSV 等顏色空間轉換（建議不要使用人臉嘗試，有些效果懂的都懂）

代碼：

intmain()
{
	Matimg1,img2,img3,img4;
	img1=imread("貓1.jpg");
	imshow("原圖",img1);
	cvtColor(img1,img2,COLOR_RGB2GRAY);
	imshow("灰度圖",img2);
	cvtColor(img1,img3,COLOR_RGB2HSV);
	imshow("HSV",img3);
	cvtColor(img1,img4,COLOR_RGB2BGR);
	imshow("BGR",img4);
	waitKey(0);
}

效果圖

代碼顏色空間轉換代碼

enumColorConversionCodes{
COLOR_BGR2BGRA=0,//!<addalphachanneltoRGBorBGRimage
COLOR_RGB2RGBA=COLOR_BGR2BGRA,
COLOR_BGRA2BGR=1,//!<removealphachannelfromRGBorBGRimage
COLOR_RGBA2RGB=COLOR_BGRA2BGR,
COLOR_BGR2RGBA=2,//!<convertbetweenRGBandBGRcolorspaces(withorwithoutalphachannel)
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,//!<convertbetweenRGB/BGRandgrayscale,@refcolor_convert_rgb_gray"colorconversions"
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,//!<convertbetweenRGB/BGRandBGR565(16-bitimages)
COLOR_RGB2BGR565=13,
COLOR_BGR5652BGR=14,
COLOR_BGR5652RGB=15,
COLOR_BGRA2BGR565=16,
COLOR_RGBA2BGR565=17,
COLOR_BGR5652BGRA=18,
COLOR_BGR5652RGBA=19,
COLOR_GRAY2BGR565=20,//!<convertbetweengrayscaletoBGR565(16-bitimages)
COLOR_BGR5652GRAY=21,
COLOR_BGR2BGR555=22,//!<convertbetweenRGB/BGRandBGR555(16-bitimages)
COLOR_RGB2BGR555=23,
COLOR_BGR5552BGR=24,
COLOR_BGR5552RGB=25,
COLOR_BGRA2BGR555=26,
COLOR_RGBA2BGR555=27,
COLOR_BGR5552BGRA=28,
COLOR_BGR5552RGBA=29,
COLOR_GRAY2BGR555=30,//!<convertbetweengrayscaleandBGR555(16-bitimages)
COLOR_BGR5552GRAY=31,
COLOR_BGR2XYZ=32,//!<convertRGB/BGRtoCIEXYZ,@refcolor_convert_rgb_xyz"colorconversions"
COLOR_RGB2XYZ=33,
COLOR_XYZ2BGR=34,
COLOR_XYZ2RGB=35,
COLOR_BGR2YCrCb=36,//!<convertRGB/BGRtoluma-chroma(akaYCC),@refcolor_convert_rgb_ycrcb"colorconversions"
COLOR_RGB2YCrCb=37,
COLOR_YCrCb2BGR=38,
COLOR_YCrCb2RGB=39,
COLOR_BGR2HSV=40,//!<convertRGB/BGRtoHSV(huesaturationvalue),@refcolor_convert_rgb_hsv"colorconversions"
COLOR_RGB2HSV=41,
COLOR_BGR2Lab=44,//!<convertRGB/BGRtoCIELab,@refcolor_convert_rgb_lab"colorconversions"
COLOR_RGB2Lab=45,
COLOR_BGR2Luv=50,//!<convertRGB/BGRtoCIELuv,@refcolor_convert_rgb_luv"colorconversions"
COLOR_RGB2Luv=51,
COLOR_BGR2HLS=52,//!<convertRGB/BGRtoHLS(huelightnesssaturation),@refcolor_convert_rgb_hls"colorconversions"
COLOR_RGB2HLS=53,
COLOR_HSV2BGR=54,//!<backwardconversionstoRGB/BGR
COLOR_HSV2RGB=55,
COLOR_Lab2BGR=56,
COLOR_Lab2RGB=57,
COLOR_Luv2BGR=58,
COLOR_Luv2RGB=59,
COLOR_HLS2BGR=60,
COLOR_HLS2RGB=61,
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,//!<convertbetweenRGB/BGRandYUV
COLOR_RGB2YUV=83,
COLOR_YUV2BGR=84,
COLOR_YUV2RGB=85,
//!YUV4:2:0familytoRGB
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,
//!YUV4:2:2familytoRGB
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,
//CV_YUV2GRAY_VYUY=CV_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,
//!alphapremultiplication
COLOR_RGBA2mRGBA=125,
COLOR_mRGBA2RGBA=126,
//!RGBtoYUV4:2:0family
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,
//!Demosaicing
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_BayerBG2GRAY=86,
COLOR_BayerGB2GRAY=87,
COLOR_BayerRG2GRAY=88,
COLOR_BayerGR2GRAY=89,
//!DemosaicingusingVariableNumberofGradients
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,
//!Edge-AwareDemosaicing
COLOR_BayerBG2BGR_EA=135,
COLOR_BayerGB2BGR_EA=136,
COLOR_BayerRG2BGR_EA=137,
COLOR_BayerGR2BGR_EA=138,
COLOR_BayerBG2RGB_EA=COLOR_BayerRG2BGR_EA,
COLOR_BayerGB2RGB_EA=COLOR_BayerGR2BGR_EA,
COLOR_BayerRG2RGB_EA=COLOR_BayerBG2BGR_EA,
COLOR_BayerGR2RGB_EA=COLOR_BayerGB2BGR_EA,
//!Demosaicingwithalphachannel
COLOR_BayerBG2BGRA=139,
COLOR_BayerGB2BGRA=140,
COLOR_BayerRG2BGRA=141,
COLOR_BayerGR2BGRA=142,
COLOR_BayerBG2RGBA=COLOR_BayerRG2BGRA,
COLOR_BayerGB2RGBA=COLOR_BayerGR2BGRA,
COLOR_BayerRG2RGBA=COLOR_BayerBG2BGRA,
COLOR_BayerGR2RGBA=COLOR_BayerGB2BGRA,
COLOR_COLORCVT_MAX=143
};

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