Quelle  alpha-vardct.html   Sprache: HTML

<!DOCTYPE html>
<title>JPEG XL: alpha with VarDCT-oriented fixture</title>
<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">
<meta name="assert" content="Decodes alpha-bearing fixture and verifies transparency exists.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<script>

promise_test(async () => {
  const img = await loadImage('resources/conformance_alpha_nonpremultiplied.jxl');
  const px = samplePixel(img, 10, 10);
  assert_less_than(px[3], 255, 'fixture should include transparent pixels');
}, 'Alpha channel is preserved for high bit-depth fixture.');

</script>