Double compression question

  • I’m curious about how your compression works with WordPress’ builtin compression.

    When an image gets uploaded is it first compressed by WordPress (quality 82) then gets sent over to you, or is it the other way around? Perhaps WordPress’ compression is bypassed altogether (although I suspect not).

    I’ve had instances where it seems like my images are getting overly compressed and showing a fair amount of artifacts and I’m wondering if this is what’s going on. Perhaps there’s a best practice you could share?

    Any light you can shed would be great!

Viewing 4 replies - 1 through 4 (of 4 total)
  • Plugin Author TinyPNG

    (@tinypng)

    The original quality is overridden by the plugin to be high enough to prevent artefacts by double compression in the vast majority of cases.

    Since you report you see artefacts, we’d be very interested to look at the images that you have uploaded. It would be great if you could send both the originals and the compressed versions to [email protected].

    Thanks!

    Thread Starter Lyndon Roeller

    (@lyndonr)

    Great, thanks for the quick answer!

    To clarify, the plugin sets WordPress’ quality from 82 to 100? So WordPress’ compression is not in the mix at all, correct?

    Sorry, I’m sure it’s not that simple but I would like to know more.

    Lyndon

    Plugin Author TinyPNG

    (@tinypng)

    The quality is not set to 100, because that is excessively high and would only cause unnecessary delays because the files are much larger. I believe it is set to 85 in the current version, which yields good results in our tests.

    Thread Starter Lyndon Roeller

    (@lyndonr)

    Cool. Thank you again for the info. So basically, yes compression is happening both by WordPress and then by TinyPNG (for JPEG). WordPress sets JPEG compression to 82 and you guys up that slightly to 85.

Viewing 4 replies - 1 through 4 (of 4 total)
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