How do I convert my vue into a component.vue - vuejs2

Question

I have a fiddle that changes the contrast and brightness of an image.
When I try and add it as a .vue component onto my site the slider no longer effects the image. I know the issue is around my filter function. I just can't understand why my :style attribute isn't applying the change to me element.
What am I doing wrong/not getting?
fiddle that works - https://jsfiddle.net/BBMAN/fxtrtqpj/14/
code for my .vue component that does not work.
<template>
<div class="brightness-slider container">
<h1>{{ msg }}</h1>
<h2>Built using Vue.js</h2>
<div class="row">
<div class="col-md-10">
<img ref="img" class="img img-responsive" :style="filters" />
</div>
<div class="col-md-2">
<strong>Contrast ({{contrast}})</strong>
<input class="slider vertical" type="range" orient="vertical" v-model="contrast" max="1" min="0" step="0.01" />
</div>
</div>
<div class="row">
<div class="col-md-12">
<h4>
<strong>Brightness ({{brightness}})</strong>
</h4>
<input class="slider horizontal" type="range" v-model="brightness" max="3" min="0" step="0.01" />
</div>
</div>
</div>
</template>
<script>
export default {
name: 'ImageBrightnessSlider',
data() {
return {
//sending data to view.
msg: 'Audience Republic Brightness Modifier',
brightness: 1,
contrast: 1
}
},computed: {
filters() {
const toDash = (str) => str.replace( /([a-z])([A-Z])/g, '$1-$2' ).toLowerCase()
debugger;
return { filter: Object.entries(this._data).filter(item => typeof(item[1]) !== 'object').map(item => `${toDash(item[0])}(${item[1]})`).join(' ') }
}
},
mounted() {
this.$refs.img.src = require('../assets/pleasure-garden-1200-by-768.jpg')
}
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h1,
h2 {
font-weight: normal;
}
ul {
list-style-type: none;
padding: 0;
}
li {
display: inline-block;
margin: 0 10px;
}
a {
color: #42b983;
}
input[type=range][orient=vertical]{
writing-mode: bt-lr; /* IE */
-webkit-appearance: slider-vertical; /* WebKit */
width: 8px;
height: 100%;
padding: 0 5px;
}
.slider {
-webkit-appearance: none;
width: 100%;
height: 3px;
border-radius: 5px;
background: #d3d3d3;
outline: none;
opacity: 0.7;
-webkit-transition: .2s;
transition: opacity .2s;
}
.slider::-webkit-slider-thumb {
-webkit-appearance: none;
appearance: none;
width: 25px;
height: 25px;
border-radius: 50%;
background: #4CAF50;
cursor: pointer;
}
.slider::-moz-range-thumb {
width: 25px;
height: 25px;
border-radius: 50%;
background: #4CAF50;
cursor: pointer;
}
</style>

Answer 1

"fiddle that works" = incorrect
you are trying to shove HTML CSS JavaScript into Javascript!!!
interpreter Javascript does not understand HTML CSS!
you code must be something like this
index.html
<div id="App">
<!-- HTML code -->
</div>
<script>
// js code
</script>
<style scoped>
/* css code */
</style>
you have many mistakes, please see official documentation
also, you can see my vue examples
UPDATED:
SFC example