This is the command grfstrip that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
GRFID — A tool strip (some) real sprites from a GRF
grfstrip origin dest [depth zoom]
GRFStrip strips all real sprites from a GRF and leaves only the ones specified in the tuples
at the command line and the 8bpp normal zoom. The new GRF file will be written to dest.
-h Display the help message.
-v Display the version.
Use grfstrip online using onworks.net services