webHTML/imageRendering.html at main · error420notfound/webHTML · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>image-rendering test</title>
<style>
  body {
    background: #111;
    color: #eee;
    font-family: monospace;
    padding: 40px;
  }

  .row {
    display: flex;
    gap: 40px;
    align-items: flex-start;
  }

  .block {
    text-align: center;
  }

  img {
    width: 256px;   /* force upscale */
    height: 256px;
    border: 1px solid #444;
  }

  .pixelated {
    image-rendering: pixelated;
  }

  .crisp {
    image-rendering: crisp-edges;
  }

  canvas {
    image-rendering: pixelated; /* important for canvas scaling */
  }
</style>
</head>
<body>

<h2>image-rendering comparison</h2>

<div class="row">
  <div class="block">
    <p>default</p>
    <img id="img-default">
  </div>

  <div class="block">
    <p>pixelated</p>
    <img id="img-pixelated" class="pixelated">
  </div>

  <div class="block">
    <p>crisp-edges</p>
    <img id="img-crisp" class="crisp">
  </div>
</div>

<h3 style="margin-top:40px;">canvas (control case)</h3>
<canvas id="canvas" width="16" height="16" style="width:256px;height:256px;border:1px solid #444;"></canvas>

<script>
const size = 16;

// create source canvas (this was missing)
const canvasSrc = document.createElement('canvas');
canvasSrc.width = size;
canvasSrc.height = size;
const ctx = canvasSrc.getContext('2d');

// color palette
const colors = [
  '#ff0033',
  '#ff7a00',
  '#ffd500',
  '#00ff99',
  '#00c3ff',
  '#6a00ff'
];

// generate striped pattern
for (let y = 0; y < size; y++) {
  for (let x = 0; x < size; x++) {

    const stripeWidth = 2;
    const index = Math.floor(x / stripeWidth) % colors.length;

    const offset = Math.sin(y * 0.8) * 0.5;
    const finalIndex = Math.abs(Math.floor(index + offset)) % colors.length;

    ctx.fillStyle = colors[finalIndex];
    ctx.fillRect(x, y, 1, 1);
  }
}

// convert to image
const dataURL = canvasSrc.toDataURL();

// assign to images
document.getElementById('img-default').src = dataURL;
document.getElementById('img-pixelated').src = dataURL;
document.getElementById('img-crisp').src = dataURL;

// visible canvas
const canvas = document.getElementById('canvas');
const ctx2 = canvas.getContext('2d');

// disable smoothing (critical)
ctx2.imageSmoothingEnabled = false;

ctx2.drawImage(canvasSrc, 0, 0);
</script>

</body>
</html>