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example.html
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example.html
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<html>
<input type="file" id="input" onchange="reader.readAsDataURL(this.files[0])">
<h1>original</h1>
<img id="original">
<h1>processed</h1>
<canvas id="canvas" hidden></canvas>
<canvas id="output"></canvas>
<script src="grafi.js"></script>
<script>
var original = document.getElementById('original')
var canvas = document.getElementById('canvas')
var output = document.getElementById('output')
var cCtx = canvas.getContext('2d')
var oCtx = output.getContext('2d')
var reader = new FileReader()
function setUpCanvas() {
output.width = original.width
output.height = original.height
canvas.width = original.width
canvas.height = original.height
cCtx.drawImage(original, 0, 0)
}
function border(){
var imagedata = cCtx.getImageData(0, 0, original.width, original.height)
var newImage = grafi.contrast(grafi.invert(grafi.contrast(grafi.grayscale(imagedata, {mode:'simple', channel:'0'}), {level:2})), {level:5})
// console.log(gsImage.data.toString())
oCtx.putImageData(newImage, 0, 0)
}
reader.onload = function() {
original.src = reader.result
}
original.onload = function () {
setUpCanvas()
border()
}
</script>
</hmtl>