update

mogrify-resize

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+#!/bin/bash
+
+width=$1
+if [ -z "$width" ]
+then
+	width=1920
+fi
+
+directory=resize-$width
+mkdir $directory
+
+# prevent empty directories from returning *.jpg in for loop
+shopt -s nullglob
+
+for ext in jpg jpeg png; do
+	for file in *."$ext"; do
+		echo resizing "$file";
+		mogrify -path $directory -filter Triangle -define filter:support=2 -thumbnail $width -unsharp 0.25x0.25+8+0.065 -dither None -posterize 136 -quality 82 -define jpeg:fancy-upsampling=off -define png:compression-filter=5 -define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude-chunk=all -interlace none -colorspace sRGB -strip "$file"
+	done
+done
+