Take the pixels bound by row/col min/max and replace them with the pixels found at the maximum row. If --smear-down is enabled, then replace the region by pixels found at the minimum row.
Full list of options:
pixel-smear
Usage: pixel-smear --file ARG [--row-min ARG] [--row-max ARG] [--col-min ARG]
[--col-max ARG] [--smear-down]
Available options:
-h,--help Show this help text
--file ARG Image to manipulate
--row-min ARG Row to start pixel smearing
--row-max ARG Row to end pixel smearing
--col-min ARG Column to start pixel smearing
--col-max ARG Column to end pixel smearing
--smear-down Use the row min as the base row, instead of row maxpixel-smear --file orig.jpg --row-min 1500 --smear-down