mirror of
https://github.com/flynx/ImageGrid.git
synced 2025-10-31 11:20:09 +00:00
253 lines
5.6 KiB
HTML
253 lines
5.6 KiB
HTML
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<!DOCTYPE html>
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<html>
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<style>
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</style>
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<script src="../ext-lib/jquery.js"></script>
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<script src="../ext-lib/jquery-ui.js"></script>
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<script src="../lib/jli.js"></script>
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<script>
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Filters = {}
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// as input takes an HTML Image object...
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Filters.getPixels = function(img, w, h){
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var w = w || img.width
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var h = h || img.height
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var c = this.getCanvas(w, h)
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var ctx = c.getContext('2d')
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if(img == null){
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ctx.rect(0, 0, w, h)
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ctx.fillStyle = "black"
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ctx.fill()
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} else {
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ctx.drawImage(img, 0, 0, w, h)
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}
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return ctx.getImageData(0,0,c.width,c.height)
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}
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Filters.setPixels = function(c, data, w, h){
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c.width = data.width
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c.height = data.height
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var ctx = c.getContext('2d')
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ctx.putImageData(data, 0, 0)
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//ctx.drawImage(data, 0, 0, w, h)
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}
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Filters.getCanvas = function(w, h){
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var c = document.createElement('canvas')
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c.width = w
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c.height = h
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return c
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}
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Filters.filterImage = function(filter, image, var_args){
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var args = [this.getPixels(image)]
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for(var i=2; i<arguments.length; i++){
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args.push(arguments[i])
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}
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return filter.apply(null, args)
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}
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Filters.grayscale = function(pixels, args){
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var d = pixels.data
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for(var i=0; i<d.length; i+=4){
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var r = d[i]
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var g = d[i+1]
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var b = d[i+2]
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// CIE luminance for the RGB
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// The human eye is bad at seeing red and blue, so we de-emphasize them.
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var v = 0.2126*r + 0.7152*g + 0.0722*b
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d[i] = d[i+1] = d[i+2] = v
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}
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return pixels
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}
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// XXX need to resize this...
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Filters.histogram = function(pixels, mode){
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mode = mode || 'luminance'
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var w = 255
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var h = 255
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// output buffer...
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var out = this.getPixels(null, w, h)
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// pixel hit buffer...
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var count = []
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var od = out.data
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var d = pixels.data
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// get the stats...
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for(var i=0; i<d.length; i+=4){
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var r = d[i]
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var g = d[i+1]
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var b = d[i+2]
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if(mode == 'luminance'){
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var v = Math.round(0.2126*r + 0.7152*g + 0.0722*b) * 4
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count[v] = count[v+1] = count[v+2] = (count[v] || 0) + 1
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} else {
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if(mode == 'color' || mode == 'R'){
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count[r*4] = (count[r*4] || 0) + 1
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}
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if(mode == 'color' || mode == 'G'){
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count[g*4+1] = (count[g*4+1] || 0) + 1
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}
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if(mode == 'color' || mode == 'B'){
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count[b*4+2] = (count[b*4+2] || 0) + 1
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}
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}
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}
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var m = 255 / Math.max(...count.filter(function(){ return true }))
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var pos = function(i, value){
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return (
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// horixontal position...
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i*4
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// value vertical offset...
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+ (255-Math.round(value*m))*w*4) }
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count.forEach(function(v, i){
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var j = pos(i/4, v)
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od[j] = 255
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// correct for blue visibility...
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if(mode != 'luminance' && (i-2)%4 == 0){
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od[j-1] = od[j-2] = 180
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}
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})
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return out
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}
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Filters.waveform = function(pixels, mode){
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mode = mode || 'luminance'
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var w = pixels.width
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// normalize pixel ratio...
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var m = (1/pixels.height)*255
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var offsetTop = 0
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var offsetBottom = 0
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// output buffer...
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var out = this.getPixels(null,
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w,
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offsetTop + 255 + offsetBottom)
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// pixel hit buffer...
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var count = []
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var od = out.data
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var d = pixels.data
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var pos = function(i, value){
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return (
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// top margin...
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offsetTop*w*4
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// horixontal position...
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+ i%(w*4)
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// value vertical offset...
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+ (255-Math.round(value))*w*4) }
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var gain = 100
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for(var i=0; i<d.length; i+=4){
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var r = d[i]
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var g = d[i+1]
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var b = d[i+2]
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var c
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var j
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if(mode == 'luminance'){
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// CIE luminance for RGB
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var v = 0.2126*r + 0.7152*g + 0.0722*b
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c = count[j = pos(i, v)] = (count[j] || 0) + m
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od[j] = od[j+1] = od[j+2] = c * gain
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} else {
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if(mode == 'color' || mode == 'R'){
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j = pos(i, r)
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c = count[j] = (count[j] || 0) + m
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od[j] = c * gain
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}
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if(mode == 'color' || mode == 'G'){
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j = pos(i, g) + 1
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c = count[j] = (count[j] || 0) + m
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od[j] = c * gain
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}
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if(mode == 'color' || mode == 'B'){
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j = pos(i, b) + 2
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c = count[j] = (count[j] || 0) + m
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od[j] = c * gain
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}
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}
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}
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return out
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}
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var WAVEFORM_SIZE = 1000
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var waveform = function(img, canvas, mode){
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var d = Filters.getPixels(img, WAVEFORM_SIZE)
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var w = Filters.waveform(d, mode)
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Filters.setPixels(canvas, w)
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}
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var HISTOGRAM_SIZE = 1000
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var histogram = function(img, canvas, mode){
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var d = Filters.getPixels(img)
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var w = Filters.histogram(d, mode)
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Filters.setPixels(canvas, w)
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}
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var start = function(){
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waveform(document.getElementById('input'), document.getElementById('waveform'), 'color')
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histogram(document.getElementById('input'), document.getElementById('histogram'), 'color')
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}
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</script>
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<body>
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<img id="input" src="../images/splash-800x500.jpg" onload="start()"/>
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<br>
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<canvas id="waveform"></canvas>
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<br>
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<button onclick="waveform(getElementById('input'), getElementById('waveform'), 'luminance')">Luminance</button>
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<button onclick="waveform(getElementById('input'), getElementById('waveform'), 'color')">Color</button>
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<button onclick="waveform(getElementById('input'), getElementById('waveform'), 'R')">R</button>
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<button onclick="waveform(getElementById('input'), getElementById('waveform'), 'G')">G</button>
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<button onclick="waveform(getElementById('input'), getElementById('waveform'), 'B')">B</button>
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<br>
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<canvas id="histogram"></canvas>
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<br>
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<button onclick="histogram(getElementById('input'), getElementById('histogram'), 'luminance')">Luminance</button>
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<button onclick="histogram(getElementById('input'), getElementById('histogram'), 'color')">Color</button>
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<button onclick="histogram(getElementById('input'), getElementById('histogram'), 'R')">R</button>
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<button onclick="histogram(getElementById('input'), getElementById('histogram'), 'G')">G</button>
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<button onclick="histogram(getElementById('input'), getElementById('histogram'), 'B')">B</button>
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</body>
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</html>
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