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Use WEBP images to make things faster #509

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Use WEBP images to make things faster #509

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Commits on May 14, 2023

  1. Add WEBP version of our hero images 

    These were converted at 20% quality:

$ convert -quality 20 @ @.20pc.webp

20% quality seems plenty for these (the quality is still pretty
good) and as these are used behind a title and a colour gradient
this seems likely to be completely fine for most usages.
    @PeterJCLaw
    PeterJCLaw committed May 14, 2023
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  2. Introduce a script which helps with converting images to WEBP 

    Relies on the user having installed ImageMagick.
    @PeterJCLaw
    PeterJCLaw committed May 14, 2023
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  3. Extract include script to create images with srcsets

    @PeterJCLaw
    PeterJCLaw committed May 14, 2023
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  4. Support WEBP for multi-size pictures 

    These images were all created using the script introduced previously.
    @PeterJCLaw
    PeterJCLaw committed May 14, 2023
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  5. Support WEBP versions of single images and use this for avatars 

    These photos of individuals are fairly large files for what they
are, so making the available in WEBP should save visitors some
download size. Created with the same script introduced previously.
    @PeterJCLaw
    PeterJCLaw committed May 14, 2023
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