Anthony and Fred, I have tested a few tools that claimed to determine the correct distortion correction coefficients for a certain camera type, but could not find one that did the job reliably. Some of them used specific test images of a special target (like equally spaced lines) that had to be photographed.
This really complicates the process of calibrating a certain camera type, as these target have to be quite large in order to be photographed from some distance. Thus I think that the approach taken by PTlens is much more promising, i.e. using modern architecture buildings as ready-made targets. Anyway, I would like to know which programm you were referring to, Anthony, in order to give it a try. So far, I didn't know that this distortion has already been implemented in IM, so thanks for the hint. But as I said, as long as we do not have a reliable tool to determine the parameters of a certain camera type, this program option is rather academic. I will try to work out the approach in somewhat more detail, applying it to a real test photograph and then come back on the subject again. This will hopefully be a matter of a few days... Wolfgang _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
