identifier "CV_BGR2GRAY" is undefined

[ZAC12549]

[katyperry13]

have you solved this issue?I got the same error.

[panda-lab]

Did you configure OpenCV?

[katyperry13]

Did you configure OpenCV?

Yes, I use opencv 4.1.0

[katyperry13]

Did you configure OpenCV?

Do I need other steps to configure opencv except includes and libs?

[panda-lab]

try 2.4.13 or 3.4.3

[katyperry13]

try 2.4.13 or 3.4.3

Have you tried it already? Does it work?

[panda-lab]

we use opencv 2.4.13, it's fine.

[peacherwu]

@katyperry13 ，新版的opencv，要用COLOR_替代CV_打头的常量。像这样：
cv::cvtColor(src, grayImage, cv::COLOR_BGR2GRAY);
cv::cvtColor(src, grayImage, cv::COLOR_RGBA2GRAY);