Picture messaging not so good from computer

It's so easy to take and send a picture message from my mobile, so why is it so hard from a computer? Neither my Thunderbird or GMail have a picture messaging mode. It just needs a way to add a photo, resize it and orient it, compress it so it downloads quick for the recipient, and send! Not that hard is it..? My GNU+Linux distro can't even copy an image to the clipboard like MS Windows has been able to since 1995!