One of the key steps in the production of large-scale digital orthophotos is stitching multiple neighboring ortho images into one seamless composite orthomosaic. In rare cases, the automated generation of the final seamless orthophoto creates unwanted artefacts on the stitched images. The ortho workflow within UltraMap Studio offers a seamline editing tool to manually choose the most suitable image to texture the orthomosaic in a certain area and modify the geometry of the seamlines.