bin/transparent: initial version

.local/bin/scripts/transparent

@@ -0,0 +1,9 @@
+#!/bin/sh -ex
+# Turn white (or another color) into transparent for the given images
+# TODO https://safe.duckduckgo.com/?q=imagemagick+color+to+alpha&ia=web https://stackoverflow.com/questions/26408022/imagemagick-color-to-alpha-like-the-gimp/27194202#27194202
+case $1 in (-*) color=${1#-};; esac
+for arg
+do  extension="-transparent.${arg##*.}"
+    case $extension in (*jp*g) extension=".png";; esac
+    convert "$arg" -transparent ${color:-white} -fuzz 60% "$arg$extension"
+done