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