import 'dart:ui';
import 'dart:math';
import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(
      title: 'Sample',
      home: HomePage(),
    ));

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  var width = 100.0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      bottomNavigationBar: Card(
        child: Container(
          height: 50,
          child: Slider(
            max: min(MediaQuery.of(context).size.width, MediaQuery.of(context).size.height),
            min: 10,
            value: width,
            onChanged: (double value) => setState(() => width = value),
          ),
        ),
      ),
      appBar: AppBar(
        title: Text('Sample'),
      ),
      body: Center(
        child: SizedBox(
          width: width,
          child: ImageFiltered(
            imageFilter: ImageFilter.blur(sigmaX: 7.0, sigmaY: 7.0),
            child: Image.network(
                "https://cdna.artstation.com/p/assets/images/images/028/571/260/large/lower-third-logo-dark.jpg?1594844508"),
          ),
        ),
      ),
    );
  }
}

import 'dart:ui';

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Sample',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Sample'),
        ),
        body: Center(
          child: ImageFiltered(
            imageFilter: ImageFilter.blur(sigmaX: 3.0, sigmaY: 3.0),
            child: Container(
              width: 50,
              height: 50,
              color: Colors.red,
            ),
          ),
        ),
      ),
    );
  }
}