hook into completed image upload filter

  • Resolved haxxxton

    (@haxxxton)


    11 years, 1 month ago

    Heya,

    I’m trying to run a little function to determine the luminance of an image and store that in the post_meta for that image..

    I have the function working, but id like it to fire when an image has finished uploading.. does anyone know the function/filter/action i should hook into for this?

    perhaps the one that creates the ‘_wp_attachment_metadata’ postmeta?

    Thanks in advance

    PS. will happily post my code when i can get this all sorted ??

Viewing 2 replies - 1 through 2 (of 2 total)
  • Thread Starter haxxxton

    (@haxxxton)

    update:

    ive now had a look at

    • image_attachment_fields_to_save
    • attachment_fields_to_save
    • wp_handle_upload
    • media_upload_form_handler
    • wp_generate_attachment_metadata

    and i just cant seem to make any of them simply run an addition to the postmeta table for the image

    currently my code looks something like:

    function insert_luminance_data($post, $attachment) {
    if ( substr($post['post_mime_type'], 0, 5) == 'image' ) {
        $lum = 'TEST';
        add_post_meta( $post['ID'], 'image_lum', $lum, true ) || update_post_meta( $post['ID'], 'image_lum', $lum );
    }
    return $post;
}

add_filter('image_attachment_fields_to_save', 'insert_luminance_data', 10, 2);

    but like i say.. this isnt working

    Thread Starter haxxxton

    (@haxxxton)

    SOLUTION thanks to s_ha_dum (over at wordpressexchange)

    function insert_luminance_data($post_ID) {
    $src = wp_get_attachment_image_src( $post_ID, 'large' )[0];
    $lum = get_avg_luminance($src, 10, true);
    add_post_meta( $post_ID, 'image_lum', $lum, true ) || update_post_meta( $post_ID, 'image_lum', $lum );
    return $post_ID;
}

add_filter('add_attachment', 'insert_luminance_data', 10, 2);

    the get_avg_luminance function (due to its size) can be found at this pastebin: https://pastebin.com/T97Mj5m8

Viewing 2 replies - 1 through 2 (of 2 total)
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