convert nikon NEF files to png

nef2png.sh

#!/bin/bash
##################################
#      Convert files to png      #
#                                #
#                                #
##################################

files=`ls ./`;
if [ ! -d png ] 
then
	mkdir png;
fi

for file in $files
do
	in=./$file;
	out=./${file%.*}".png";
	if [ ! -f $out ] 
	then
		echo "converting $file";
		convert "$in" -resize 1024x1024 "$out" ;
		mv $out png/;
	fi
done

Simple script for generating previews using imagemagic.

the -resize option of 1024x1024 will generate a image with max width or height (which ever is larger) of 1024. There are loads of other options

http://www.imagemagick.org/script/command-line-options.php#resize

http://www.imagemagick.org/script/command-line-processing.php#geometry