I was looking for the same... After going on a wild goose chase...
include/func/func.image.php
Quote:
if (isset($icon_sizes[$skin_name])) {
$result = $icon_sizes[$skin_name];
} else {
$result = array('width' => '16', 'height' => '16'); //Default value for 3rd party skins.
}
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(You'll need to regenerate the image cache after adjusting dimensions)