Over the years I've been able to uncover the following "extra features" that HPIS has to offer... the option you want is -k which will stop the animation:

-bXX -- border pixel size (border color depends on image color?) -c -- crop center -hXXXX -- height -h -- (without XXX) puts white padding around border -d -- download -g -- Google+ panorama XML? -k -- stop animation -n -- crop from... somewhere between top and center? (requires -hXXX -wYYYY) -p -- crop from top? -rXXX -- rotate in degrees (90/180/270) -sXXXX -- size to best fit -wYYYY -- width -v[0|1|2|3] -- quality level/file size (highest to lowest) Other combos: -hXXXXX-wYYYY-s -- stretch to fit (only some images will stretch?)

would love to hear from anyone else that has uncovered more of these gems?