The following script converts a cylindrical input image
image.jpg to a equirectangular 3000x1500 output image.
Drop the script together with the jpeg file onto the 
PTStitcher icon. Afterwards, remove the black bands
from the output image and it is ready to show in
PTViewer.

p w3000 h1500 f2 v360 n"JPEG g0 q95"
i n"image.jpg"
o f1 y0 r0 p0 v360