Ptgui works well. There is also the Cartagen mapknitter software that is web based. It allows you to roughly orthorectify and place each image on top of several sources of free base imagery. http://mapknitter.org/ It was originally developed for enabling common people to stitch maps from aerial imagery taken from point and shoot cameras rigged on helium filled garbage bags / balloons.
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Ptgui works well. There is also the Cartagen mapknitter software that is web based. It allows you to roughly orthorectify and place each image on top of several sources of free base imagery. http://mapknitter.org/ It was originally developed for enabling common people to stitch maps from aerial imagery taken from point and shoot cameras rigged on helium filled garbage bags / balloons.
why photoshop?