flattenpsd.sh

#!/bin/bash

# flattenpsd - A simple script to read a PSD and save each layer as a PNG.
#

INPUT_FILE=$1
OUTPUT_DIR=$2

if [ "$2" == "" ]; then
    echo "Usage: $0 <input_psd> <output_dir>"
    exit 1
fi

if [ ! -r $INPUT_FILE ]; then
    echo "unable to open input file '$INPUT_FILE'"
    exit 2
fi

if [ ! -d $OUTPUT_DIR ]; then
    echo "output dir doesn't exist or is not a directory"
    exit 2
fi

# find out how many layers are in the PSD
num_layers=`convert $INPUT_FILE -format "%[scenes]" info: | head -n 1`

# for some reason krita's PSDs have an extra layer that breaks things. ignore it.
let num_layers=num_layers-1

echo "exporting $num_layers layers."

# loop through each layer 
for x in `seq 1 $num_layers`; do
    # get the label name and use that in your convert
    label=`convert $INPUT_FILE[$x] -verbose info: | grep "label:" | sed -e "s/label://"|sed "s/^ *//"`
    echo "exporting layer '$label'"

    # convert to a png. 
    # use 'trim' to auto-crop the transparent parts as well. IM is awesome!
    convert $INPUT_FILE[$x] -trim "$OUTPUT_DIR/${label}.png"
done

exit 0