Empty webp versions

  • Resolved Benedikt Ledl

    (@benniledl)


    1 year, 2 months ago

    Hello,

    I’ve used the plugin for a longer time and it was always working well, today I’ve noticed the .webp versions of new images that I upload are just an empty file.

Viewing 6 replies - 1 through 6 (of 6 total)
  • Jeremy Varnham

    (@jvarn13)

    1 year, 2 months ago

    I’ve noticed this issue recently on PNG images with transparency that I have shrunk using TinyPNG.com, which seems to convert images colour mode from TrueColorAlpha to PaletteAlpha.

     $ identify -verbose original.png | grep "Type"
    Type: TrueColorAlpha

     $ identify -verbose minified.png | grep "Type"
    Type: PaletteAlpha

    Regenerating the two images

    $ sudo -u apacheuser wp media regenerate 32694 32751 --url=example.com
    Found 2 images to regenerate.
    1/2 Regenerated thumbnails for "minified" (ID 32751).
    Warning: imagewebp(): Palette image not supported by webp in /var/www/example.com/wp-includes/class-wp-image-editor.php on line 572
    2/2 Regenerated thumbnails for "minified" (ID 32694).
    Success: Regenerated 2 of 2 images.

    The result: original works but minified gives a zero size file.

    $ ls -l wp-content/uploads/2025/02/
    -rw-r--r-- 1 apacheuser apachegroup 69166 Feb 11 11:19 wp-content/uploads/2025/02/original.png
    -rw-r--r-- 1 apacheuser apachegroup 20064 Feb 11 11:20 wp-content/uploads/2025/02/original-png.webp
    -rw-r--r-- 1 apacheuser apachegroup 48600 Feb 11 07:56 wp-content/uploads/2025/02/minified.png
    -rw-r--r-- 1 apacheuser apachegroup 0 Feb 11 11:20 wp-content/uploads/2025/02/minified-png.webp

    • This reply was modified 1 year, 2 months ago by Jeremy Varnham. Reason: formatting
    Thread Starter Benedikt Ledl

    (@benniledl)

    1 year, 2 months ago

    -rw-r--r-- 1 someuser someuser 13412 2025-02-07 08:18 image-name-1024x576.webp
    -rw-r--r-- 1 someuser someuser   858 2025-02-07 08:18 image-name-150x150.webp
    -rw-r--r-- 1 someuser someuser 25160 2025-02-07 08:18 image-name-1536x864.webp
    -rw-r--r-- 1 someuser someuser  2052 2025-02-07 08:18 image-name-300x169.webp
    -rw-r--r-- 1 someuser someuser  9086 2025-02-07 08:18 image-name-768x432.webp
    -rw-r--r-- 1 someuser someuser 33812 2025-02-07 08:18 image-name.png
    -rw-r--r-- 1 someuser someuser     0 2025-02-07 08:18 image-name-png.webp
    Thread Starter Benedikt Ledl

    (@benniledl)

    1 year, 2 months ago

    Thanks for the tip @jvarn13

    I now re-exported the problematic images in sRGB format and it is working again.

    Jeremy Varnham

    (@jvarn13)

    1 year, 2 months ago

    Do you know the image-name.png colour type?

    identify -verbose image-name.png | grep "Type"

    If it is PaletteAlpha or Palette, this might be the same problem (webp not supporting palette colour types causing the conversion to fail).

    PNG color types:

    Grayscale Only shades of gray, no color, no transparency.
    TrueColor Full RGB colors, no transparency.
    Indexed (Palette) Uses a limited palette of colors (indexed color mode).
    GrayscaleAlpha Grayscale with transparency.
    TrueColorAlpha Full RGB colors with transparency (RGBA).
    PaletteAlpha Indexed (palette-based) colors with transparency.

    Jeremy Varnham

    (@jvarn13)

    1 year, 2 months ago

    Great! You posted your second reply as I was still writing 🙂

    Thread Starter Benedikt Ledl

    (@benniledl)

    1 year, 2 months ago

    Even tho the problem was solved for me, I’ll still document this here if anyone needs it in the future.

    The type of these broken images is “Palette”.

    identify -verbose problem-image.png | grep "Type"
      Type: Palette
Viewing 6 replies - 1 through 6 (of 6 total)

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