Can I force all uploaded images to be reduced in quality?

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There is a blog where high quality images (300KB at 800×550) are being uploaded and embedded at Full Size. WordPress will just use the exact uploaded picture when you embed at Full Size. This makes total sense, but I’d like to override that and force it to generate and use a more optimised image. Is there a way to process these Full Size images to present a lower quality, say 70%? I don’t want to resize them.

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I have a client who runs a very popular blog, with lots of photos on it. I’ve instructed them many times about saving at an appropriate quality for the web, but they have been “forgetting” for 6 months now. Yet they complain about their site being slow – hardly surprising when it has between 1 and 4 megs of 100% quality JPEGs on the page, which can easily be reduced to 100-200KB without any visible loss of quality. At this point I have to assume that they’re never going to change their habits, so I’m trying to find an automated solution.

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1 comment

  1. Yes, there is actually a filter hook to change JPEG compression ratio. You could add these lines to your functions.php:

    add_filter( 'jpeg_quality', 'jpeg_custom_quality' );
function jpeg_custom_quality( $quality ) {
    return 70;
}

    You may change 70 to whatever value you want.

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