This work aims to present an improvement to the image compositing stateof- the-art technique using Differential Rendering. An application is developed using HDR images, in which combining virtual and real elements into a single scene produces better results than the ones obtained by the original technique. Firstly, this work presents some techniques of image compositing, and concepts on HDR images and image-based lighting. Next, the original technique by Paul Debevec is presented through its calculations and examples of image compositing. The proposed improvement adds one more image to the set of images used by the original technique. This improvement is of great importance for applications that need a high degree of realism, because it allows a better integration between the virtual and real parts of a scene. Several tests are presented that prove the effectiveness of the proposed improvement.