Zach’s ugly mug (his face)

Zach Leatherman

imaging-heap, Measuring Responsive Image Efficiency

March 21, 2018 Tagged: Project

From deep in the archives (2 years late!), filed under “things I built but never posted on my web site”:

A command line tool to measure the efficiency of your responsive image markup across viewport sizes and device pixel ratios.

Works out-of-the-box with img (of course), img[srcset], img[srcset][sizes], picture, picture[srcset], picture[srcset][sizes]. Ignores *.svg files. No support for background images yet.

  • npm install -g imaging-heap
  • e.g. imagingheap https://www.zachleat.com/
  • View on: GitHub or npm
  • Retweet

Inspired by

  • Hugely inspired by the NCC Image Checker Chrome Extension (which is a great visual tool). The main difference here is that imaging-heap will collate data across viewport sizes and device pixel ratios.
  • RespImageLint a Linter Bookmarklet for Responsive Images

Sample output

╔══════════╤══════════╤═══════╤════════════╤════════╤════════════╤════════╤════════════╗
║          │ Image    │ @1x   │ @1x        │ @2x    │ @2x        │ @3x    │ @3x        ║
║          │ Width in │ Image │ Percentage │ Image  │ Percentage │ Image  │ Percentage ║
║ Viewport │ Layout   │ Width │ Match      │ Width  │ Match      │ Width  │ Match      ║
╟──────────┼──────────┼───────┼────────────┼────────┼────────────┼────────┼────────────╢
║ 320px    │ 161px    │ 301px │ 187.0%     │ 301px  │ 93.5%      │ 601px  │ 125.2%     ║
║ 480px    │ 241px    │ 301px │ 124.9%     │ 601px  │ 125.2%     │ 601px  │ 83.5%      ║
║ 640px    │ 321px    │ 601px │ 187.2%     │ 601px  │ 93.6%      │ 901px  │ 93.9%      ║
║ 800px    │ 401px    │ 601px │ 149.9%     │ 901px  │ 112.6%     │ 1201px │ 100.1%     ║
║ 960px    │ 480px    │ 600px │ 125.0%     │ 900px  │ 93.8%      │ 1200px │ 83.3%      ║
║ 1120px   │ 560px    │ 600px │ 107.1%     │ 1200px │ 107.1%     │ 1200px │ 71.4%      ║
║ 1280px   │ 640px    │ 900px │ 140.6%     │ 1200px │ 93.8%      │ 1200px │ 62.5%      ║
╚══════════╧══════════╧═══════╧════════════╧════════╧════════════╧════════╧════════════╝
Zach’s ugly mug (his face)

Zach is a builder for the web. He created IndieWeb Avatar for https://www.11ty.devEleventy (11ty), an award-winning open source site generator now full-time sponsored by IndieWeb Avatar for https://www.netlify.comNetlify. At one point he became entirely too fixated on web fonts. He has given 62 talks in eight different countries at events like Jamstack Conf, Beyond Tellerrand, Smashing Conference, CSSConf, and The White House. Formerly part of Filament Group, NEJS CONF, and NebraskaJS. Read more about Zach »

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