If you’re wondering why there is no Extract filter in PhotoShop CS4, you do rightfully so since it’s not a part of the base CS4 installation anymore.

However, you can download the plugin right here. All you need to do is to copy the plugin file to the Plug-ins > Filters directory of the CS4 installation, restart PhotoShop and you’re good to go!

Having copied the Extract filter to the Filters folder, "Extract..." will appear in the Filters menu once again.