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  "articleBody": "Prompt [to Claude Opus 5.5 High](https://claude.ai/share/71adda96-193f-4f2a-97c0-454e08066afb):\n\n> `Build an artifact where you open a photo and it rapidly (in a few seconds) paints a version of that photo using a canvas element and simulated paintbrush`\n\nSee also [my previous experiment](https://simonwillison.net/2026/Aug/25/pelican-watercolor/) getting Claude Fable to simulate a watercolor illustration with P5.js.\n\n![A simulated oil painting of a photograph of a heron](https://static.simonwillison.net/static/2026/heron-oil.webp)\n\nQuick Study uses [Sobel edge detection](https://en.wikipedia.org/wiki/Sobel_operator), with no external libraries beyond Google Fonts.\n\nPosted [23rd October 2026](https://simonwillison.net/2026/Oct/23/) at 9:35 pm\n",
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  "content_html": "<p>Prompt <a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://claude.ai/share/71adda96-193f-4f2a-97c0-454e08066afb\">to Claude Opus 5.5 High</a>:</p>\n<blockquote>\n<p><code>Build an artifact where you open a photo and it rapidly (in a few seconds) paints a version of that photo using a canvas element and simulated paintbrush</code></p>\n</blockquote>\n<p>See also <a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://simonwillison.net/2026/Aug/25/pelican-watercolor/\">my previous experiment</a> getting Claude Fable to simulate a watercolor illustration with P5.js.</p>\n<p><picture class=\"article-picture article-picture-fallback\" style=\"--image-ratio:16 / 9\"><img src=\"https://static.simonwillison.net/static/2026/heron-oil.webp\" alt=\"A simulated oil painting of a photograph of a heron\" loading=\"eager\" decoding=\"async\" fetchpriority=\"high\" referrerpolicy=\"no-referrer\" class=\"progressive-image\"></picture></p>\n<p>Quick Study uses <a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://en.wikipedia.org/wiki/Sobel_operator\">Sobel edge detection</a>, with no external libraries beyond Google Fonts.</p>\n<p>Posted <a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://simonwillison.net/2026/Oct/23/\">23rd October 2026</a> at 9:35 pm</p>\n",
  "content_markdown": "Prompt [to Claude Opus 5.5 High](https://claude.ai/share/71adda96-193f-4f2a-97c0-454e08066afb):\n\n> `Build an artifact where you open a photo and it rapidly (in a few seconds) paints a version of that photo using a canvas element and simulated paintbrush`\n\nSee also [my previous experiment](https://simonwillison.net/2026/Aug/25/pelican-watercolor/) getting Claude Fable to simulate a watercolor illustration with P5.js.\n\n![A simulated oil painting of a photograph of a heron](https://static.simonwillison.net/static/2026/heron-oil.webp)\n\nQuick Study uses [Sobel edge detection](https://en.wikipedia.org/wiki/Sobel_operator), with no external libraries beyond Google Fonts.\n\nPosted [23rd October 2026](https://simonwillison.net/2026/Oct/23/) at 9:35 pm\n",
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  "summary": "Tool: Quick Study Prompt to Claude Opus 5.5 High: Build an artifact where you open a photo and it rapidly (in a few seconds) paints a version of that photo using a canvas element and simulated paintbrush See also my previous experiment getting Claude Fable to simulate a watercolor illustration with P5.js. Quick Study uses Sobel edge detection, with no external libraries beyond Google Fonts. Tags: tools",
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  "title": "Quick Study",
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