经常需要截图举例子，就需要一些 DEMO 文件，就放在这里慢慢收集吧。
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PDF 文档
https://bitcoin.org/files/bitcoin-paper/bitcoin_zh_cn.pdf
这里选取了比特币白皮书，其它语言在这里。
https://www.adobe.com/support/products/enterprise/knowledgecenter/media/c4611_sample_explain.pdf
https://github.com/apple/cups/blob/master/examples/document-a4.pdf
https://github.com/apple/cups/blob/master/examples/document-letter.pdf
https://github.com/apple/cups/blob/master/examples/onepage-a4.pdf
https://github.com/apple/cups/blob/master/examples/onepage-letter.pdf
https://github.com/apple/cups/blob/master/examples/testfile.pdf
https://opensource.apple.com/source/cups/cups-136.9/cups/test/testfile.pdf
https://opensource.apple.com/source/cups/cups-30/test/testfile.pdf
https://github.com/mozilla/pdf.js/blob/master/web/compressed.tracemonkey-pldi-09.pdf
https://orimi.com/pdf-test.pdf
https://www.vistajet.com/globalassets/sample.pdf
https://www.pdf995.com/samples/pdf.pdf
https://www.stat.berkeley.edu/~freedman/sample.pdf
https://faculty.haas.berkeley.edu/stanton/texintro/jf/jfsample.pdf
https://dagrs.berkeley.edu/sites/default/files/2020-01/sample.pdf
A Sample SRS Document - [PDF Document]
Home - PDF Viewer Test - UMGC Library at University of Maryland Global Campus
打印机测试用图
一些特定的图像格式
https://github.com/davidmz/apng-canvas/tree/gh-pages/images
一些 PNG 动态图，来自 apng-canvas JS 库
APNG Software - Samples 1
另一个 APNG 的示例
https://github.com/webmproject/libwebp/blob/main/examples/test.webp
https://github.com/webmproject/libwebp/blob/main/webp_js/test_webp_js.webp
https://github.com/webmproject/libwebp/blob/main/webp_js/test_webp_wasm.webp
GitHub - webmproject/libwebp-test-data: Mirror only. Please do not send pull requests.
https://github.com/webmproject/webp-wic-codec/tree/main/example
谷歌官方的示例图片
https://github.com/nokiatech/heif/tree/gh-pages/content
诺基亚发布的示例图片，包含 HEIF 格式
https://github.com/strukturag/libheif/blob/master/examples/example.avif
https://github.com/strukturag/libheif/blob/master/examples/example.heic
libheif 源码库里面的两张示例图片
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