Flutter Background Backdrop image blur combined with fading effect.

BackdropImageBlur.dart

ClipRect(
	child: ShaderMask(
		shaderCallback: (rect) {
			return LinearGradient(
            	begin: Alignment.center,
                end: Alignment.bottomCenter,
                colors: [
                	Theme.of(context).backgroundColor,
                    Colors.transparent
                  ],
			).createShader(Rect.fromLTRB(0, 0, rect.width, rect.height));
		},
              blendMode: BlendMode.dstIn,
              child: ImageFiltered(
                imageFilter: ImageFilter.blur(
                    sigmaX: 15, sigmaY: 15, tileMode: TileMode.mirror),
                child: Image.network(
                  "",
                  fit: BoxFit.cover,
			),
		),
	),
),