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Quelle cicp-chunk.htmlSprache: HTML |
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<!DOCTYPE html> <title>PNG test: cICP chunk</title> <link rel="help" href="https://w3c.github.io/PNG-spec/#cICP-chunk"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/html/canvas/resources/canvas-tests.js"></script> <body> <h1>cICP chunk</h1> <p class="desc">test pixel values of a display-p3 PNG</p> <p class="output">Actual output:</p> <canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback co <ul id="d"></ul> <script> var t = async_test("test pixel values of a display-p3 PNG"); const img = new Image(); img.onload = () => { _addTest(function(canvas, ctx) { ctx.drawImage(img, 0, 0); var pixel = ctx.getImageData(5, 5, 1, 1, {colorSpace: "srgb"}).data; // The pixel values stored are (51 red, 102 green, 153 blue). // These numbers are chosen because 0.2 * 255 = 51. // The image has a cICP chunk indicating the Display P3 color space. // This results in decoded pixel values of (27 red, 104 green, 157 blue). const pixel_expected = [27, 104, 157, 255]; const epsilon = 2; _assertSame(pixel.length, pixel_expected.length, "pixel.length", "pixel_expected.le assert_approx_equals(pixel[0], pixel_expected[0], epsilon); assert_approx_equals(pixel[1], pixel_expected[1], epsilon); assert_approx_equals(pixel[2], pixel_expected[2], epsilon); assert_approx_equals(pixel[3], pixel_expected[3], epsilon); }, {colorSpace: "display-p3"}); }; img.src = "support/cicp-display-p3.png"; </script>
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2026-08-25