attachment_fu, width/height of original image


Q: How can I get height/width of original image (not tumbnail)?

I'm using attachment_fu plugin. (thanks to the author!)

model has following options
  has_attachment :content_type => :image,
                 :storage => :file_system,
                 :max_size => 5000.kilobytes

as it tells, I don't use thumbnail feature.

I uploaded image files, file were uploaded well, but width/height
fields of model are nil. (NULL in database).

for testing, when I add thumbnail feature to model, width/height
column of thumbnail image record have proper values (width/height of
thumbnailed image).

Is there option of attachment_fu for setting original image's(not
thumbnail) width/height field properly? (the fields are set properly
for thumbnail images) or should I hack attachment_fu to do that?