Systems, methods, and apparatus, including computer program products, for forming composite images using gradient-domain compositing are provided. In some implementations, a method is provided. The method includes receiving two or more source images and aligning the received source images to form an assembled composite image. The method also includes stitching the seams between the aligned source images in the assembled composite image to form a final composite image. The stitching includes performing a gradient domain compositing. The gradient domain compositing uses a subset of pixels in the assembled composite image including calculating individual pixel values along the seams and interpolating pixel values away from the seams.