All info are coming from preview picture. You're right.
We will have a look for a specific change.


the SIZE appear as N/A.
To update it

Create your ./include/config_local.inc.php like:

<?php
// +-----------------------------------------------------------------------+
// |                               metadata                                |
// +-----------------------------------------------------------------------+

// show_iptc: Show IPTC metadata on picture.php if asked by user
$conf['show_iptc'] = false;

// show_iptc_mapping : is used for showing IPTC metadata on picture.php
// page. For each key of the array, you need to have the same key in the
// $lang array. For example, if my first key is 'iptc_keywords' (associated
// to '2#025') then you need to have $lang['iptc_keywords'] set in
// language/$user['language']/common.lang.php. If you don't have the lang
// var set, the key will be simply displayed
//
// To know how to associated iptc_field with their meaning, use
// tools/metadata.php
$conf['show_iptc_mapping'] = array(
  'iptc_keywords'        => '2#025',
  'iptc_caption_writer'  => '2#122',
  'iptc_byline_title'    => '2#085',
  'iptc_caption'         => '2#120'
  );

// use_iptc: Use IPTC data during database synchronization with files
// metadata
$conf['use_iptc'] = true;

// use_iptc_mapping : in which IPTC fields will PhpWebGallery find image
// information ? This setting is used during metadata synchronisation. It
// associates a phpwebgallery_images column name to a IPTC key
$conf['use_iptc_mapping'] = array(
  'keywords'        => '2#025',
  'date_creation'   => '2#055',
  'author'          => '2#122',
  'name'            => '2#005',
  'comment'         => '2#120'
  );

// show_exif: Show EXIF metadata on picture.php (table or line presentation
// avalaible)
$conf['show_exif'] = true;

// show_exif_fields : in EXIF fields, you can choose to display fields in
// sub-arrays, for example ['COMPUTED']['ApertureFNumber']. for this, add
// 'COMPUTED;ApertureFNumber' in $conf['show_exif_fields']
//
// The key displayed in picture.php will be $lang['exif_field_Make'] for
// example and if it exists. For compound fields, only take into account the
// last part : for key 'COMPUTED;ApertureFNumber', you need
// $lang['exif_field_ApertureFNumber']
//
// for PHP version newer than 4.1.2 :
// $conf['show_exif_fields'] = array('CameraMake','CameraModel','DateTime');
//
$conf['show_exif_fields'] = array(
  'Make',
  'Model',
  'DateTimeOriginal',
  'COMPUTED;ApertureFNumber'
  );

// use_exif: Use EXIF data during database synchronization with files
// metadata
$conf['use_exif'] = true;

// use_exif_mapping: same behaviour as use_iptc_mapping
$conf['use_exif_mapping'] = array(
  'date_creation' => 'DateTimeOriginal'
  );
?>

Read comments in the module above.

My parameters for example are:

<?php
$conf['show_iptc'] = true;
$conf['use_iptc'] = true;
$conf['show_exif'] = true;
$conf['use_exif'] = true;
// for PHP version newer than 4.1.2 :
// $conf['show_exif_fields'] = array('CameraMake','CameraModel','DateTime');
$conf['show_exif_fields'] = array(
  'Make',
  'Model',
  'DateTimeOriginal',
  'ExposureTime',
  'FNumber',
  'FocalLength',
  'ExposureBiasValue',
  'MeteringMode',
  'Flash',
  'COMPUTED;ApertureFNumber'
  );   
// use_exif_mapping: same behaviour as use_iptc_mapping
$conf['use_exif_mapping'] = array(
  'date_creation' => 'DateTimeOriginal'
  );
$conf['show_iptc_mapping'] = array(
  'iptc_caption_writer'  => '2#122',
  'iptc_byline_title'    => '2#085',
  'iptc_caption'         => '2#120'
  );
$conf['use_iptc_mapping'] = array(
  'author'          => '2#122',
  'date_creation'   => '2#055',
  'name'            => '2#005',
  'keywords'        => '2#025',
  'comment'         => '2#120'
  );
?>

config_local.inc.php is your file. So just ONLY add parameters you decided to change.
All available parameters do NOT have to be updated directly in config_default.inc.php.

We will be back soon for HR picture.
If we forget you in few days, please Up your topic.
8-)