If you wanted to remove or delete undesirable objects from the digital photo,what photo software that you needed ? Photoshop or GIMP ?You can tried this software,inpaint just for remove the objects in the photo.
Inpaint will analyzes the selected area and attempts to fill it with pixels that match the surrounding area of the object to be removed.The program produces good results with objects on plain backgrounds or simple patterns (sky, sand, concrete, grass etc.) I have tried this software and the result as below;
You see the tree disappeared.You also can use this software to remove watermark inside photo.
This software is a shareware and compatible with Window 2000/2003/XP.
Download Inpaint .