Best way to subtract a Scalar from a Mat

[msmartin4470]

What is the best way to achieve something like this (copied from opencv in c++)?

outputImage = (inputImage - 5)

I basically want to subtract a single value from every element in a Mat. I think the solution is to use Scalar(5) in Java, but I could not get that to work here. Thanks for your help and great package!

[rainyl]

@msmartin4470 check Mat.subtract https://pub.dev/documentation/opencv_dart/latest/cv/Mat/subtract.html

[rainyl]

dart doesn't support operator overloading, check dart-lang/language#2456 , once the feature is implemented, we can do some thing like outputImage = (inputImage - 5)