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<link rel="stylesheet" href="css/sally.css" type="text/css" charset="utf-8" />
<link rel="stylesheet" href="css/ak.css" type="text/css" charset="utf-8" />
<style>
* {
font-smooth: never;
-webkit-font-smoothing: none;
}
</style>
<body class="loading">
<center>
<div id="canvas_rapper" style="margin: 0 auto;margin-top:7%;margin-bottom:7%">
</div>
</body>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="js/util.js"></script>
<script src="js/color_code.js"></script>
<script src="js/color.js"></script>
<script src="js/lex.js"></script>
<script src="js/matrix.js"></script>
<script>
// var color_hue_order = ("black dark-blue purple dark-red red orange " +
// "yellow lime green teal cyan blue magenta dark-gray light-gray white").split(" ");
var grid_w = 6, grid_h = 3, gap = 1
var pixel = [0,0,0]
// 25% opacity
// f(a,b) = a + (b - 1/2)
var canvas = new Matrix ( grid_w * 16, grid_h * 16, function(x,y){
var lex = new Lex (x,y)
var i = floor(x / grid_w)
var j = floor(y / grid_h)
var opacity = (x % grid_w) / (grid_w-2)
if ( (x % grid_w) != grid_w-gap && (y % grid_h) != grid_h-gap) {
var a = Photo.colors[ all_hue(i) ]
var b = Photo.colors[ all_hue(j) ]
var a0 = a[0]/255 * opacity
var a1 = a[1]/255 * opacity
var a2 = a[2]/255 * opacity
var b0 = b[0]/255 * (1 - opacity)
var b1 = b[1]/255 * (1 - opacity)
var b2 = b[2]/255 * (1 - opacity)
pixel[0] = clamp( a0 + b0, 0, 1 ) * 255
pixel[1] = clamp( a1 + b1, 0, 1 ) * 255
pixel[2] = clamp( a2 + b2, 0, 1 ) * 255
lex.fg = lex.bg = Photo.closest_to(pixel)
lex.char = " "
}
else if ((y % grid_h) == grid_h-gap) {
lex.span.style.lineHeight = "4px"
lex.span.style.fontSize = "4px"
}
lex.opacity = 1
lex.build()
return lex
})
var label = document.createElement("span")
label.innerHTML = "<br>opacity (0, 25%, 50%, 75%, 100%)<br><br>"
canvas_rapper.appendChild(label)
canvas.append(canvas_rapper)
//
var grid_w = 3, grid_h = 2, gap = 1
// multiply
// f(a,b) = a * b
var canvas = new Matrix ( grid_w * 16, grid_h * 16, function(x,y){
var lex = new Lex (x,y)
var i = floor(x / grid_w)
var j = floor(y / grid_h)
if ( (x % grid_w) != grid_w-gap && (y % grid_h) != grid_h-gap) {
var a = Photo.colors[ all_hue(i) ]
var b = Photo.colors[ all_hue(j) ]
pixel[0] = clamp( a[0]/255 * b[0]/255, 0, 1 ) * 255
pixel[1] = clamp( a[1]/255 * b[1]/255, 0, 1 ) * 255
pixel[2] = clamp( a[2]/255 * b[2]/255, 0, 1 ) * 255
lex.fg = lex.bg = Photo.closest_to(pixel)
lex.char = " "
}
else if ((y % grid_h) == grid_h-gap) {
lex.span.style.lineHeight = "4px"
lex.span.style.fontSize = "4px"
}
lex.opacity = 1
lex.build()
return lex
})
var label = document.createElement("span")
label.innerHTML = "<br>multiply<br><br>"
canvas_rapper.appendChild(label)
canvas.append(canvas_rapper)
// screen
// f(a,b) = 1 - (1-a) * (1-b)
var canvas = new Matrix ( grid_w * 16, grid_h * 16, function(x,y){
var lex = new Lex (x,y)
var i = floor(x / grid_w)
var j = floor(y / grid_h)
if ( (x % grid_w) != grid_w-gap && (y % grid_h) != grid_h-gap) {
var a = Photo.colors[ all_hue(i) ]
var b = Photo.colors[ all_hue(j) ]
pixel[0] = clamp( 1 - (1-a[0]/255) * (1-b[0]/255), 0, 1 ) * 255
pixel[1] = clamp( 1 - (1-a[1]/255) * (1-b[1]/255), 0, 1 ) * 255
pixel[2] = clamp( 1 - (1-a[2]/255) * (1-b[2]/255), 0, 1 ) * 255
lex.fg = lex.bg = Photo.closest_to(pixel)
lex.char = " "
}
else if ((y % grid_h) == grid_h-gap) {
lex.span.style.lineHeight = "4px"
lex.span.style.fontSize = "4px"
}
lex.opacity = 1
lex.build()
return lex
})
var label = document.createElement("span")
label.innerHTML = "<br>screen<br><br>"
canvas_rapper.appendChild(label)
canvas.append(canvas_rapper)
// overlay
//
// f(a,b) = | 2 * a * b if lum(a) < 0.5
// | 1 - 2 *(1-a) * (1-b) otherwise
var canvas = new Matrix ( grid_w * 16, grid_h * 16, function(x,y){
var lex = new Lex (x,y)
var i = floor(x / grid_w)
var j = floor(y / grid_h)
if ( (x % grid_w) != grid_w-gap && (y % grid_h) != grid_h-gap) {
var a = Photo.colors[ all_hue(i) ]
var b = Photo.colors[ all_hue(j) ]
var a0 = a[0]/255
var a1 = a[1]/255
var a2 = a[2]/255
var b0 = b[0]/255
var b1 = b[1]/255
var b2 = b[2]/255
var lum = getLuminance(a0, a1, a2)
if (lum < 0.5) {
pixel[0] = clamp( 2 * a0 * b0, 0, 1 ) * 255
pixel[1] = clamp( 2 * a1 * b1, 0, 1 ) * 255
pixel[2] = clamp( 2 * a2 * b2, 0, 1 ) * 255
}
else {
pixel[0] = clamp( 1 - 2 * (1-a0) * (1-b0), 0, 1 ) * 255
pixel[1] = clamp( 1 - 2 * (1-a1) * (1-b1), 0, 1 ) * 255
pixel[2] = clamp( 1 - 2 * (1-a2) * (1-b2), 0, 1 ) * 255
}
lex.fg = lex.bg = Photo.closest_to(pixel)
lex.char = " "
}
else if ((y % grid_h) == grid_h-gap) {
lex.span.style.lineHeight = "4px"
lex.span.style.fontSize = "4px"
}
lex.opacity = 1
lex.build()
return lex
})
var label = document.createElement("span")
label.innerHTML = "<br>overlay (luminance)<br><br>"
canvas_rapper.appendChild(label)
canvas.append(canvas_rapper)
// overlay #2 is the same but compares RGB components individually
//
// f(a,b) = | 2 * a * b if a < 0.5
// | 1 - 2 *(1-a) * (1-b) otherwise
var canvas = new Matrix ( grid_w * 16, grid_h * 16, function(x,y){
var lex = new Lex (x,y)
var i = floor(x / grid_w)
var j = floor(y / grid_h)
if ( (x % grid_w) != grid_w-gap && (y % grid_h) != grid_h-gap) {
var a = Photo.colors[ all_hue(i) ]
var b = Photo.colors[ all_hue(j) ]
var a0 = a[0]/255
var a1 = a[1]/255
var a2 = a[2]/255
var b0 = b[0]/255
var b1 = b[1]/255
var b2 = b[2]/255
if (a0 < 0.5) {
pixel[0] = clamp( 2 * a0 * b0, 0, 1 ) * 255
}
else {
pixel[0] = clamp( 1 - 2 * (1-a0) * (1-b0), 0, 1 ) * 255
}
if (a1 < 0.5) {
pixel[1] = clamp( 2 * a1 * b1, 0, 1 ) * 255
}
else {
pixel[1] = clamp( 1 - 2 * (1-a1) * (1-b1), 0, 1 ) * 255
}
if (a2 < 0.5) {
pixel[2] = clamp( 2 * a2 * b2, 0, 1 ) * 255
}
else {
pixel[2] = clamp( 1 - 2 * (1-a2) * (1-b2), 0, 1 ) * 255
}
lex.fg = lex.bg = Photo.closest_to(pixel)
lex.char = " "
}
else if ((y % grid_h) == grid_h-gap) {
lex.span.style.lineHeight = "4px"
lex.span.style.fontSize = "4px"
}
lex.opacity = 1
lex.build()
return lex
})
var label = document.createElement("span")
label.innerHTML = "<br>overlay (componentwise)<br><br>"
canvas_rapper.appendChild(label)
canvas.append(canvas_rapper)
document.body.className = ""
function getLuminance(var_R, var_G, var_B) {
var var_Min = Math.min( var_R, var_G, var_B ) //Min. value of RGB
var var_Max = Math.max( var_R, var_G, var_B ) //Max. value of RGB
return ( var_Max + var_Min ) / 2
}
</script>
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