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index.html
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<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<title>Monochroman</title>
<script type="text/javascript">
const BACKEND_URL = undefined
</script>
<style>
* {
transition: all 0.1s ease;
font-family: monospace;
}
body {
margin: 0;
text-align: center;
color: #eee;
background: #414141;
}
h1 {
font-size: 2.25rem;
}
a {
color: inherit;
}
.sidebar {
padding: 0px 0px;
width: 240px;
height: 100vh;
overflow: hidden;
background: #333;
}
.sidebar.left {
float: left;
}
.sidebar.right {
float: right;
}
.sidebar canvas {
max-width: 200px;
max-height: 170px;
cursor: zoom-out;
}
.sidebar canvas.mini {
max-height: 85px;
max-width: 100px;
cursor: zoom-in;
}
#workarea {
position: absolute;
margin: 20px;
width: calc(100% - 240px - 240px - 40px);
height: calc(100% - 40px);
left: 240px;
overflow: hidden;
}
#file-selector {
display: block;
border: 3px dotted #999;
cursor: pointer;
height: 100%;
width: 100%;
overflow: auto;
position: relative;
box-sizing: border-box;
}
#file-selector span {
display: block;
width: 100%;
padding: 35vh 0;
position: absolute;
}
#file-selector div {
display: flex;
align-items: center;
justify-content: center;
min-height: 100%;
}
#work-canvas {
position: relative;
transform: scale(1);
transform-origin: top center;
cursor: zoom-in;
}
#work-canvas.zoom {
transform: scale(3);
cursor: zoom-out;
}
#dithered-canvas,
#work-canvas {
image-rendering: pixelated;
}
#footbar {
position: absolute;
bottom: 0;
width: 240px;
background: #222222;
padding: 1em 0;
}
#display {
margin-bottom: 0.5rem;
}
#display[data-val=""] + #dimensions {
display: flex;
}
#dimensions {
display: flex;
flex-direction: row;
justify-content: space-between;
align-items: center;
}
.tools {
overflow: hidden;
max-height: 600px;
}
.tools:not(:first-child) {
margin-top: 10px;
}
.tools.collapsed {
max-height: 25px;
}
.tools label small {
position: absolute;
left: 10px;
top: 5px;
}
.tools label {
display: block;
position: relative;
margin-top: 0.3em;
}
.collapser {
width: 100%;
background: #222;
border: none;
color: #888;
cursor: pointer;
text-align: left;
padding: 0.25em 1em;
}
.collapser:hover {
background: #252525;
}
.collapser:active {
background: #2a2a2a;
}
.collapser::after {
content: "\25B2";
float: right;
transform: scaleY(1);
transition: all 0.1s ease;
}
.collapsed .collapser::after {
transform: scaleY(-1);
}
select {
border: none;
overflow: hidden;
background: #414141;
margin-top: 0.5em;
width: 175px;
}
optgroup {
color: #aaa;
}
option {
color: #e9ecee;
}
.reset {
cursor: pointer;
vertical-align: super;
position: absolute;
right: 10px;
}
.gs-modes {
margin: 0.5em 0;
}
.gs-modes label {
margin: 0;
}
.gs-modes button {
font-size: 50%;
padding: 0.1em 0.2em;
margin-bottom: 0.5em;
}
big {
font-weight: bold;
}
input[type=range] {
width: 170px;
margin: 0;
}
input[type=number] {
width: 5em;
background: #c8c8c8;
border: 1px solid;
padding: 0.2em;
margin: 0.4em;
}
input[type=radio] {
margin: 0;
vertical-align: text-top;
}
.setting {
padding: 0 20px 10px;
text-align: left;
}
.setting big {
display: block;
background: #222222;
color: #888;
margin: 10px -20px 10px;
padding: 0.25em 1em;
}
.setting label span {
vertical-align: middle;
}
.setting select {
width: 100%;
}
.setting input {
margin: 0.4em 0.4em 0 0;
border: 0px;
}
menu {
margin: 20px 0 0 ;
padding: 0;
}
menu button {
width: 200px;
cursor: pointer;
}
button b {
font-size: 125%;
vertical-align: middle;
}
#by {
}
#by a {
text-decoration: none;
display: inline-block;
border-bottom: 1px dotted white;
}
</style>
<script>
const $ = document.querySelector.bind(document)
const $$ = document.querySelectorAll.bind(document)
const filters = {
// Fixed thresholding
0: null,
"3c": [ // clustered pattern
[8, 3, 4],
[6, 1, 2],
[7, 5, 9],
],
"3d": [ // disparsed pattern
[1, 7, 4],
[5, 8, 3],
[6, 2, 9],
],
"2": [ // Bayer 2×2
[1, 3],
[4, 2],
],
"4": [ // Bayer 4×4
[1, 9, 3, 11],
[13, 5, 15, 7],
[4, 12, 2, 10],
[16, 8, 14, 6],
],
"8": [ // Bayer 8×8
[ 1, 33, 9, 41, 3, 35, 11, 43],
[49, 17, 57, 25, 51, 19, 59, 27],
[13, 45, 5, 37, 15, 47, 7, 39],
[61, 29, 53, 21, 63, 31, 55, 23],
[ 4, 36, 12, 44, 2, 34, 10, 42],
[52, 20, 60, 28, 50, 18, 58, 26],
[16, 48, 8, 40, 14, 46, 6, 38],
[64, 32, 56, 24, 62, 30, 54, 22],
],
// The Floyd-Steinberg filter
a: [
[ , , ,],
[ ,0,7,],
[3,5,1,], // (1/16)
],
// The Jarvis, Judice, and Ninke filter
b: [
[ , , , , ,],
[ , , , , ,],
[ , ,0,7,5,],
[3,5,7,5,3,],
[1,3,5,3,1,], // (1/48)
],
// P. Stucki (rework of the Jarvis, Judice, and Ninke filter in 1981)
c: [
[ , , , , ,],
[ , , , , ,],
[ , ,0,8,4,],
[2,4,8,4,2,],
[1,2,4,2,1,], // (1/42)
],
// The Sierra3 1989 (three-line):
d: [
[ , , , , ,],
[ , , , , ,],
[ , ,0,5,3,],
[2,4,5,4,2,],
[ ,2,3,2, ,], // (1/32)
],
// Atkinson (Apple 1980)
e: [
[ , , , , ,],
[ , , , , ,],
[ , ,0,1,1,],
[ ,1,1,1, ,],
[ , ,1, , ,], // (1/8)
]
}
const dimension = {
width: 1050,
height: 750,
}
const gsWeights = {
r: 0.299,
g: 0.587,
b: 0.114,
}
const vals = {
brightness: 0.0,
contrast: 0.0,
threshold: 0.5,
noise: 0.1,
range: 0.75,
filter: 'b',
}
const imageSize ={
width: 0,
height: 0,
}
const pixelBreak = 2**19
// pregenerate randomnumbers
const randomMess = Array(2**19-1)
let nextRandIndex = 0
for(let i = 0; i < randomMess.length; i++) {
randomMess[i] = Math.random()
}
window.onload = () => {
$$("input[type=range]").forEach((input) => {
if (!(input.id in vals)) {
return
}
const update = () => {
if(["brightness", "contrast"].includes(input.id)) {
reGrey()
} else {
reMono()
}
}
const defVal = vals[input.id]
input.value = defVal
input.onchange = () => {
vals[input.id] = +input.value
update()
}
input.onmousewheel = (e) => {
e.preventDefault()
input.value = +input.value + +input.step * -e.deltaY/100
input.onchange()
}
const resetBtn = document.createElement('a')
resetBtn.className = "reset"
resetBtn.title = "default"
resetBtn.innerText = "\u293a"
resetBtn.onclick = () => {
input.value = defVal
input.onchange()
}
input.parentElement.append(resetBtn)
})
if(typeof BACKEND_URL ==='undefined') {
$("#send-button").hidden = true
}
$$(".tools").forEach((toolbox) => {
const btn = document.createElement("button")
btn.className = "collapser"
btn.onclick = () => {
toolbox.classList.toggle("collapsed")
}
const title = toolbox.firstElementChild
toolbox.insertBefore(btn, title)
btn.appendChild(title)
})
$$(".tools canvas").forEach((thumb) => {
thumb.onclick = () => {
thumb.classList.toggle("mini")
}
})
$("#width").value = dimension.width
$("#height").value = dimension.height
$("#gswr").value = gsWeights.r
$("#gswg").value = gsWeights.g
$("#gswb").value = gsWeights.b
$("#filter").value = vals.filter
$("#file-selector").addEventListener("dragenter", stop, false)
$("#file-selector").addEventListener("dragover", stop, false)
$("#file-selector").addEventListener("drop", loadImage(handleImage), false)
$("#file").addEventListener("change", loadImage(handleImage))
const retireFileSelector = once(() => {
$("#file-selector").setAttribute("for", "")
$("#file-selector span").remove()
})
// TODO generalize
const colored = $("#colored-canvas")
const greyscaled = $("#greyscaled-canvas")
const dithered = $("#dithered-canvas")
colored.width = greyscaled.width = dithered.width = 0
colored.height = greyscaled.height = dithered.height = 0
const clrCtx = colored.getContext("2d")
const gsCtx = greyscaled.getContext("2d")
const dtCtx = dithered.getContext("2d")
clrCtx.imageSmoothingEnabled = false
gsCtx.imageSmoothingEnabled = false
dtCtx.imageSmoothingEnabled = false
const work = $("#work-canvas")
work.onclick = () => {
work.classList.toggle("zoom")
}
const wCtx = work.getContext("2d")
wCtx.imageSmoothingEnabled = false
const removeAlpha = (imageData, toColor=1) => {
imageData.data.forEach((val, i, list) => { // remove alpha
if (i % 4 === 3) {
const a = val / 255
if (toColor) { // replace alpha with white
list[i - 1] = 255 - (255 - list[i - 1]) * a
list[i - 2] = 255 - (255 - list[i - 2]) * a
list[i - 3] = 255 - (255 - list[i - 3]) * a
} else { // replace alpha with black
list[i - 1] *= a
list[i - 2] *= a
list[i - 3] *= a
}
list[i] = 255
}
})
return imageData
}
function handleImage() {
retireFileSelector()
imageSize.width = dimension.width = this.width
imageSize.height = dimension.height = this.height
$('#display').value = '×'
// set thumbnail sizes
const [, , , , , , thumbWidth, thumbHeight] = fit(this.width, this.height, 200, 170)
colored.width = greyscaled.width = dithered.width = thumbWidth
colored.height = greyscaled.height = dithered.height = thumbHeight
clrCtx.drawImage(this, 0, 0, thumbWidth, thumbHeight)
// remove alpha from thumb
const thumbImageData = removeAlpha(clrCtx.getImageData(0, 0, thumbWidth, thumbHeight), 1)
clrCtx.putImageData(thumbImageData, 0, 0)
let origData
let gsData
let dtData
resize = () => {
const [sx, sy, sw, sh, dx, dy, dw, dh] = getDim(this.width, this.height, dimension.width, dimension.height)
work.width = dimension.width
work.height = dimension.height
wCtx.drawImage(this, sx, sy, sw, sh, dx, dy, dw, dh)
// prepare image data layers
origData = removeAlpha(wCtx.getImageData(0, 0, work.width, work.height), 1)
wCtx.putImageData(origData, 0, 0)
gsData = new ImageData(work.width, work.height)
dtData = new ImageData(work.width, work.height)
gsData.data.set(origData.data) // because we want preserve alpha
dtData.data.set(origData.data)
reGrey()
}
const getThreshold = () => vals.threshold + (randomMess[nextRandIndex++ % randomMess.length]*vals.noise - vals.noise/2)
const asyncIt = new AsyncIterator()
const reWork = async (all) => {
const filterMap = filters[vals.filter]
let monochroming = filterToMonochroming(vals.filter)
try {
all && await asyncIt.iterate(
greyscaling,
[origData, gsData, gsWeights, vals.brightness, vals.contrast],
([data, height, y]) => {
// wCtx.putImageData(gsData, 0, 0, 0, 0, data.width, height-y)
},
)
await asyncIt.iterate(
monochroming,
[gsData, dtData, getThreshold, filterMap, vals.range],
([data, height, y]) => {
wCtx.putImageData(dtData, 0, 0, 0, y, data.width, height-y)
},
)
} catch (e) {
console.log(e)
}
sendBitmap("partial")
}
let timeoutId
reGrey = () => {
const imageData = clrCtx.getImageData(0, 0, thumbWidth, thumbHeight)
for(let data of greyscaling(imageData, imageData, gsWeights, vals.brightness, vals.contrast)) {
gsCtx.putImageData(imageData, 0, 0)
}
gsCtx.putImageData(imageData, 0, 0)
reMono(true)
}
reMono = (all) => {
const filterMap = filters[vals.filter]
const imageData = gsCtx.getImageData(0, 0, thumbWidth, thumbHeight)
let monochroming = filterToMonochroming(vals.filter)
for(let data of monochroming(imageData, imageData, getThreshold, filterMap, vals.range)) {
dtCtx.putImageData(imageData, 0, 0)
}
dtCtx.putImageData(imageData, 0, 0)
clearTimeout(timeoutId)
timeoutId = setTimeout(reWork, 50, all)
}
resize()
}
}
function setSaveHref() {
const imageUrl = $("#work-canvas").toDataURL("image/png")
$("#download-link").setAttribute("href", imageUrl)
}
function setSaveBitmapHref() {
const imageUrl = "data:;base64," + arrayBufferToBase64(canvasToBitmap($("#work-canvas")))
$("#download-bitmap-link").setAttribute("href", imageUrl)
}
function sendBitmap(updateType) {
BACKEND_URL && fetch(`${BACKEND_URL}${updateType}`, {
cors: 'no-cors',
method: 'POST',
body: canvasToBitmap($("#work-canvas")),
}).catch((e) => {
if (updateType === "full" ) {
window.alert(`Server is unreachable\n\n ${e}`)
} else {
console.error(e)
}
})
}
function canvasToBitmap(canvas) {
const data = canvas.getContext("2d").getImageData(0, 0, canvas.width, canvas.height).data
// reserve byte for every 8 pixels + 4 bites to store width and height
const bytes = new Uint8Array(4 + data.length/4/8)
bytes[0] = canvas.width >> 8
bytes[1] = canvas.width
bytes[2] = canvas.height >> 8
bytes[3] = canvas.height
for (let i = 0; i < data.length; i += 4) { // sample R subpixels
bytes[4 + (i>>5)] |= data[i] && (128 >> ((i/4)%8)) // i >> 5 means Math.floor(i/(4*8))
}
return bytes
}
function resize() {}
function reGrey() {}
function reMono() {}
function getDim() { return fill(...arguments) }
function selectDisplay(display) {
if(!display) {
dimension.width = +$("#width").value
dimension.height = +$("#height").value
} else {
const [width, height] = display.split('×').map((x, i) => +(x || [ imageSize.width, imageSize.height ][i]))
dimension.width = width
dimension.height = height
$("#width").value = width
$("#height").value = height
}
resize()
}
function selectWidth(value) {
$('#display').value = ''
dimension.width = +value
resize()
}
function selectHeight(value) {
$('#display').value = ''
dimension.height = +value
resize()
}
function flipDimension() {
$('#display').value = ''
const w = +$("#width").value
const h = +$("#height").value
dimension.height = $("#height").value = w
dimension.width = $("#width").value = h
resize()
}
function stop(e) {
e.stopPropagation()
e.preventDefault()
}
// contain
function fit (w, h, maxWidth, maxHeight) {
let height, width
if (w/h < maxWidth/maxHeight) {
height = maxHeight
width = w * height/h
} else {
width = maxWidth
height = h * width/w
}
return [
0, 0, w, h, // src
(maxWidth-width)/2, (maxHeight-height)/2, width, height // dest
]
}
// cover & crop
function fill (w, h, maxWidth, maxHeight) {
let srcH, srcW
if (w/h > maxWidth/maxHeight) {
srcH = h
srcW = maxWidth * h/maxHeight
} else {
srcW = w
srcH = maxHeight * w/maxWidth
}
return [
(w-srcW)/2, (h-srcH)/2, srcW, srcH, // source
0, 0, maxWidth, maxHeight, // dest
]
}
function loadImage(onImageLoad) {
return function(e) {
stop(e)
const files = this.files || e.dataTransfer.files
for(const file of files) {
if (!file.type.match(/image.*/)) {
console.error("not image")
return
}
$("#download-link").setAttribute("download", file.name.split(".")[0] + ".dithered.png")
$("#download-bitmap-link").setAttribute("download", file.name.split(".")[0] + ".dithered.bits")
console.log("image dropped")
let reader = new FileReader()
reader.onload = (e) => {
let image = new Image()
image.onload = onImageLoad
image.src = e.target.result
console.log("reader loaded image")
}
reader.readAsDataURL(file)
this.value = ""
}
}
}
function filterToMonochroming(filterIndex) {
if(+filterIndex === 0) {
return thresholding
}
if(["3c","3d", "2", "4", "8"].includes(filterIndex)) {
return patterning
}
if("abcde".includes(filterIndex)) {
return dithering
}
}
function* greyscaling(srcData, destData, weight, brightness, contrast) {
const src = srcData.data
const dest = destData.data
const factor = (contrast + 1) / (1 - contrast)
for (let i = 0; i < src.length; i += 4) {
const [r, g, b] = [src[i+0], src[i+1], src[i+2]]
let grey = weight.r*r + weight.g*g + weight.b*b
grey = factor * (grey-128) + 128
grey += brightness * 255
dest[i+0] = grey
dest[i+1] = grey
dest[i+2] = grey
if (i % pixelBreak === 0) {
yield [destData, ...getDoneHeightAndY(i/4, destData.width, pixelBreak)]
}
}
return [destData, destData.height, 0]
}
function* thresholding(srcData, destData, getThreshold) {
const src = srcData.data
const dest = destData.data
const B = 0, W = 255
for(let i = 0; i < src.length; i += 4) {
const c = (src[i] <= 256 * getThreshold() ? B : W)
dest[i+0] = c
dest[i+1] = c
dest[i+2] = c
if(i % pixelBreak === 0) {
yield [destData, ...getDoneHeightAndY(i/4, destData.width, pixelBreak)]
}
}
return [destData, destData.height, 0]
}
function* patterning(srcData, destData, getThreshold, filter, range) {
const src = srcData.data
const dest = destData.data
const width = srcData.width
const B = 0, W = 255
const size = filter.length
for(let i = 0; i < src.length; i += 4) {
const x = i/4 % width
const y = (i/4 - x) / width
const level = filter[x%size][y%size]/(size**2+1) // eg. 0..16
const threshold = level*range + (1-range)/2 + getThreshold()-0.5
const c = (src[i] <= 256 * threshold ? B : W)
dest[i+0] = c
dest[i+1] = c
dest[i+2] = c
if(i % pixelBreak === 0) {
yield [destData, ...getDoneHeightAndY(i/4, destData.width, pixelBreak)]
}
}
return [destData, destData.height, 0]
}
function* dithering(srcData, destData, getThreshold, filter, range) {
const src = srcData.data
const dest = destData.data
const errBuff = Array(dest.length/4)
const width = srcData.width
const height = srcData.height
const B = 0, W = 255
const [fox, foy] = [-Math.floor(filter.length/2), -Math.floor(filter[0].length/2)] // filter center offset
const weightSum = filter.reduce((sum, line) => sum + line.reduce((sum, w) => sum+w, 0), 0)
const spread = range/weightSum
// init error buffer
for(let i = 0; i < errBuff.length; i++) {
errBuff[i] = 0
}
for(let i = 0; i < src.length; i += 4) {
const x = i/4 % width
const y = (i/4 - x) / width
const clr = clamp(-Infinity, +Infinity, src[i] + errBuff[i/4])
const c = (clr <= 256 * getThreshold() ? B : W)
const err = clr - c
dest[i+0] = c
dest[i+1] = c
dest[i+2] = c
// distribute error:
for(let j = -foy; j < filter.length; j++) {
for(let i = 0; i < filter[j].length; i++) {
const weight = filter[j][i]
if(!weight) {
continue
}
const xi = x+i+fox
const yi = y+j+foy
if(xi < 0 || xi >= width || yi < 0 || yi >= height) {
continue
}
errBuff[xi + yi*width] += err*weight*spread
}
}
if(i % pixelBreak === 0) {
yield [destData, ...getDoneHeightAndY(i/4, destData.width, pixelBreak)]
}
}
return [destData, destData.height, 0]
}
function getDoneHeightAndY(i, width, pixelBreak) {
return [getDoneHeight(i, width), getDoneY(i, width, pixelBreak)]
}
function getDoneHeight(i, width) {
return (i - i % width)/width
}
function getDoneY(i, width, pixelBreak) {
return getDoneHeight(i-pixelBreak, width)
}
function clamp(min, max, val) {
return Math.max(min, Math.min(max, val))
}
function setGSWeights(what, v) {
gsWeights[what] = v
// normalize
const ratio = (1-gsWeights[what])/(gsWeights.r + gsWeights.g + gsWeights.b - gsWeights[what])
if (what !== 'r') gsWeights.r *= ratio
if (what !== 'g') gsWeights.g *= ratio
if (what !== 'b') gsWeights.b *= ratio
$("#gswr").value = gsWeights.r
$("#gswg").value = gsWeights.g
$("#gswb").value = gsWeights.b
}
function gsPreset(mode) {
switch(mode) {
case 'r':
case 'g':
case 'b':
setGSWeights(mode, 1)
break
case 'avg':
$("#gswr").value = gsWeights.r = .333
$("#gswg").value = gsWeights.g = .333
$("#gswb").value = gsWeights.b = .333
break
case 'light1': //https://en.wikipedia.org/wiki/Relative_luminance - sRGB
$("#gswr").value = gsWeights.r = .2126
$("#gswg").value = gsWeights.g = .7152
$("#gswb").value = gsWeights.b = .0722
break
case 'light2': // http://www.w3.org/TR/AERT#color-contrast
$("#gswr").value = gsWeights.r = .299
$("#gswg").value = gsWeights.g = .587
$("#gswb").value = gsWeights.b = .114
break
}
}
class AsyncIterator {
constructor () {
this.iterators = new WeakMap()
}
iterate (iterFunc, args, collector) {
const iterator = iterFunc(...args)
this.iterators.set(iterFunc, iterator)
const promis = new Promise((resolve, reject) => {
const step = () => {
if(iterator !== this.iterators.get(iterFunc)) {
return reject("interrupted")
}
const {value, done} = iterator.next()
collector(value)
if (!done) {
setTimeout(step, 0)
} else {
resolve(value)
}
}
setTimeout(step, 0)
})
return promis
}
}
function once (fn) {
let was = false
return () => {
if(!was) {
was = true
return fn(...arguments)
}
}
}
function arrayBufferToBase64(buffer) {
return btoa(String.fromCharCode.apply(null, buffer))
}
</script>
<div class="sidebar left">
<div><h1>Monochroman</h1></div>
<div class="tools">
<big>File</big>
<div class="setting">
<menu>
<label for="file"><button onclick="this.parentElement.click()"><b>📁</b> open</button></label>
<a id="download-link" download><button onclick="setSaveHref()"><b>💾</b> save png</button></a>
<a id="download-bitmap-link" download><button onclick="setSaveBitmapHref()"><b>💾</b> save bitmap</button></a>
<button id="send-button" onclick="sendBitmap('full')"><b>⇧</b> send bitmap</button>
</menu>
</div>
</div>
<div class="tools">
<big>Resolution</big>
<div class="setting">
<select id="display" onchange="selectDisplay(this.value); this.dataset.val = this.value" size="10">
<optgroup label="e-paper">
<option value="200×200">1.54" (200 × 200)</option>
<option value="122×250">2.13" (122 × 250)</option>
<option value="128×296">2.9" (128 × 296)</option>
<!-- <option value="400×300">4.2" (400 x 300)</option> -->
</optgroup>
<optgroup label="display">
<option value="640×480">VGA (640 × 480)</option>
<option value="1280×720">HD (1280 × 720)</option>
<option value="1920×1080">FHD (1920 × 1080)</option>
</optgroup>
<option value="×" selected>original</option>
<option value="">custom</option>
</select>
<div id="dimensions">
<div>
<label>
<input id="width" type="number" min="16" step="8" onchange="selectWidth(this.value)">
<span>width</span>
</label>
<label>
<input id="height" type="number" min="16" step="8" onchange="selectHeight(this.value)">
<span>height</span>
</label>
</div>
<button id="rotate-dimension" onclick="flipDimension()">⤪</button>
</div>
</div>
</div>
<div class="tools">
<big>Fit mode</big>
<div class="setting">
<label title="whole image fitted to area" >
<input type="radio" name="size-method" value="fit" onchange="this.checked && (getDim = fit); resize()">
<span>contain (bars)</span>
</label>
<label title="whole area covered by image" >
<input type="radio" name="size-method" value="fill" onchange="this.checked && (getDim = fill); resize()" checked>
<span>cover (crop)</span>
</label>
</div>
</div>
<div class="tools">
<big>Help</big>
<div class="setting">
<b>Bitmap format:</b>
<div style="text-align: left">
<div>(Ex. for 8×8 chess pattern)</div>
<code style="white-space: pre">
bin:
00000000 00001000 > width
00000000 00001000 > height