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I'm looking to invert an image, such that black would become white.

I'm using the C++ OpenCV. The documentation seems to suggest that:

cv::subtract(cv::Scalar:all(255),src,dst);

would work. It doesn't, though it compiles.

I know I can go through pixel by pixel, but I am writing a application that processes live video and need to take advantage of whatever optimizations I can.

Any suggestions are appreciated! I feel like I'm missing something, because the subtract function doesn't appear to be overloaded from looking at the header file...

I'm looking to invert an image, such that black would become white.

I'm using the C++ OpenCV. The documentation seems to suggest that:

cv::subtract(cv::Scalar:all(255),src,dst);

would work. It doesn't, though it compiles.

I know I can go through pixel by pixel, but I am writing a application that processes live video and need to take advantage of whatever optimizations I can.

Any suggestions are appreciated! I feel like I'm missing something, because the subtract function doesn't appear to be overloaded from looking at the header file...

I'm looking to invert an image, such that black would become white.

I'm using the C++ OpenCV. The documentation seems to suggest that:

cv::subtract(cv::Scalar:all(255),src,dst);

would work. It doesn't, though it compiles.

I know I can go through pixel by pixel, but I am writing a application that processes live video and need to take advantage of whatever optimizations I can.

Any suggestions are appreciated! I feel like I'm missing something, because the subtract function doesn't appear to be overloaded from looking at the header file...