Image saved as progressive but size variants appear not to be

  • Anyone noticed this?

    I have been saving images – optimised to a reasonable level. Then saved as Progressive. However, when I run the webpagetest.org tool on them, I see that it sometimes reports that resized images are not progressive.

    In detail, I save red-shoes.jpg as 50kb and progressive, it gets used on the site, I run webpagetest.org and it flags up red-shoes-150×150.jpg is not progressive.

    I know that when uploading images to WP, you get size variants produced, quite a few 24×24, 3030,36×36,300×300 and so on, 12 variants or so.

    I think WP produces these automatically. Has anyone seen this, and knows why it is happening?

    Unfortunately I have not found a quick way to see if an image ( or all variants) are progressive. Is this something you can find out easily?

    • This topic was modified 4 years, 10 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic
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  • Moderator Samuel Wood (Otto)

    (@otto42)

    www.ads-software.com Admin

    Resized images will not be saved as progressive. Specifically the WordPress image handling code does not save things as interlaced images by default.

    If you want to use your original image, then that is saved without alteration. Simply use the “Full Size” image when inserting into a post to use the original, non-resized, image. The original uploaded image is always preserved as-is.

    Thread Starter robmcp

    (@robmcp)

    Thanks Samuel.

    The things you didn’t know you didn’t know!
    We’ll live with this – OR we could re-save resized versions as and when they are reported by the tool and FTP replace them.

    Helpful to confirm that WP does not do the variants. Thanks again.
    Rob.

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