Make 3px rounded corners on PNG images

round_corners.sh

#!/bin/bash

# Usage: find . -name "epg_cell_bg_*" -exec ./round_corners.sh '{}' \;

convert $1 \( +clone -alpha extract -draw 'fill black polygon 0,0 0,3 3,0 fill white circle 3,3, 3,0' \( +clone -flip \) \
    -compose Multiply -composite \( +clone -flop \) -compose Multiply -composite \) -alpha off  \
    -compose CopyOpacity -composite $1

script named "round_corners.sh" but in #usage you call "roundit.sh" — I guess there is a mistake there.

yep )
First it was called roundit )

nice work, starred:)