Flutter opacity on image within container

Question

I couldn't find a way to make this image within a container opaque.

Container(
      margin: EdgeInsets.symmetric(
          vertical: 12, horizontal: 8),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(40),
        image: DecorationImage(
            image: AssetImage("images/img.png"),
            fit: BoxFit.scaleDown),
      ),
      child: SomeWidget(),
    )

Answer 1

As you are using DecorationImage and it has a method colorFilter you can use it for the opacity

Here is the sample how I am using it in my code.

colorFilter: new ColorFilter.mode(Colors.black.withOpacity(0.2), BlendMode.dstATop),

And you can also use this

Answer 2

Inside a container's decoration section, just like sunny's answer above but instead of Colors.black use Colors.white:

              Container(
                  decoration: BoxDecoration(
                      image: new DecorationImage(
                    image: new AssetImage("assets/images/tankicon.png"),
                    fit: BoxFit.scaleDown,
                    colorFilter: ColorFilter.mode(
                        Colors.white.withOpacity(0.2), BlendMode.dstATop),
                  )),
                  child: