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Modify Nextgen Gallery to Extract Picasa’s Caption

, 18 Sep 2013
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How to modify Nextgen gallery to extract Picasa's caption

I use Picasa to manage my photos locally and Nextgen gallery (a Wordpress plugin) as my online photo albums.

And in Picasa, captions can be added to photo’s meta tags, like this:

nextgen_gallery_pre

When uploaded to Nextgen gallery, I would like to have this caption be added to the photo’s title and description. So I modified the Nextgen gallery to support this.

The modifications in Nextgen gallery plugin:

1. Modify admin/function.php:

At line number 661, replace:

$alttext = empty( $meta['title'] ) ? $image->alttext : $meta['title'];

// get the caption / description field
$description = empty( $meta['caption'] ) ? $image->description : $meta['caption'];

with:

if (!$alttext = $meta['title'])
    $alttext = ($meta['keywords'] . " " . $meta['camera']);

// get the caption / description field
if (!$description = $meta['caption'])
    $description = ($meta['exif_desc'] . " " . $meta['keywords'] );
else
    $description = ( $description . ' [EXIF :: ' . $meta['exif_desc'] . ']' );


if( trim($alttext) == "" || trim($alttext) == "Exif_JPEG_PICTURE" ){
    if( $meta['caption'] )
        $alttext = $meta['caption'];
    else
        $alttext = $description;
}

At line 734, add:

$meta['exif_desc'] = ($pdata->get_META('camera') . " :: " . 
$pdata->get_META('focal_length') .  " :: " . $pdata->get_META('shutter_speed') . 
" :: " . $pdata->get_META('aperture') . " :: 
ISO " . $pdata->get_META('iso') . " :: " . 
$pdata->get_META('created_timestamp'));

2. Modify lib/meta.php

At line 237, replace:

if ($this->iptc_data[$key])
    $meta[$value] = trim(utf8_encode(implode(", ", $this->iptc_data[$key])));

with:

if($this->iptc_data[$key] && $key == "2#120"){
    $meta[$value] = mb_convert_encoding(implode
    (", ", $this->iptc_data[$key]), 'UTF-8', 'gb2312');
}
else if($this->iptc_data[$key]){
    $meta[$value] = trim(utf8_encode(implode(", ", $this->iptc_data[$key])));
}

And the final result looks like:

nextgen_gallery_result

You may download the modified package here. (In the package, there are also some modifications in the UI, you may compare the package with the original one to see the difference.)

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

JIN Weijie
Software Developer (Senior) Honeywell
China China
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