Yahoo is taking on yet another acquisition as it seeks to reinvigorate itself and — in this case — Flickr as well. GhostBird software has just announced that it will be joining the Flickr team after being purchased by Yahoo. The developer is notably the name behind PhotoForge 2, a popular and robust photo editing app for iOS. PhotoForge offered the type of powerful features, such as layers, masks, and curves, that are usually only found in desktop image editors like Photoshop. GhostBird also made a photo filtering app called KitCam, though both apps will be removed from the App Store today.