For reference, I’ll here post the tool’s help info, so you can see its feature set more easily.
poly@omino-8999 domework: om_sphere2dome --help om_sphere2dome This command line tool transforms a spherically-projected image file to a Domemaster image file (180 degree fisheye). The source image is a 2:1 aspect ratio equirectangular projection, as produced by Modo's spherical camera. The center square is extracted and transformed. See http://omino.com/pixelblog/2015/03/03/modo-for-fulldome- part-2/ --help Optional. Show help. --infile=<file name> Required. A source .png or .jpg image, 2:1 aspect ratio, spherically projected. --outfile=<file name> Required. The output .png or .jpg image to write, square, Domemaster projection. --vflip=<yes or no> Optional. Vertically flip the image. --size=<number> Optional. Size of output image. --azimuth=<number> Optional. Shifts view negative-left or positive-right in degrees. Written by firstname.lastname@example.org, 2015. Uses Lode Vandevenne's excellent lodepng library from http://lodev.org/lodepng/. Uses Rich Geldreich's wonderful single-file jpeg library from https://code.google.com/ p/jpeg-compressor/. 8x8 font created by John Hall, http://overcode.yak.net/ 12, no longer with us.