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I'm porting an OpenCV 2.2 app from Unix (that works) onto Windows 7 64-bit and I receive the following exception when cv::imwrite is called "OpenCV Error: Unspecified error (could not find a writer for the specified extension) in unknown function, file highgui\src\loadsave.cpp" The original unix app works fine on my Mac and Linux boxes. Does anyone know what library or compiler config I could be missing that makes this work on Windows? UPDATE: I did the following things to get OpenCV running: Downloaded the binaries for v2.2 from the OpenCV site for windows. I'm using 2.2 because the original app uses it and I don't want to complicate my build at this stage. I am trying to imwrite to a .png file. I looked at the OpenCV code and noticed the necessity for external libs for Encoders such as Pngs or jpegs, so I tried writing to .ppm, .bmp which seems not to require deps, but I get the identical error. An example of my usage is cv::imwrite("out.png", cv_scaled); where cv_scaled is of type cv::Mat with format CV_32FC1 Please remember the identical code works fine in unix The fact .bmp or .ppm doesn't work this raises more questions: Why don't these very simple formats work? Is there a way to see a list of installed Encoders programmatically? Thanks again for your kind assistance in helping me debug this problem.

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