imgdiff

#!/bin/bash

# To configure git:
# git config difftool.imgdiff.cmd "path/to/imgdiff \"\$MERGED\" \"\$LOCAL\" \"\$REMOTE\""

# To run from git:
# git difftool -t imgdiff [<commit> [<commit>]] [--] [<path>...]

MERGED="$1"
LOCAL="$2"
REMOTE="$3"

FORMAT="Image;%Width% %Height%"

LOCAL_SIZE=`mediainfo --Inform="$FORMAT" "$LOCAL"`
REMOTE_SIZE=`mediainfo --Inform="$FORMAT" "$REMOTE"`

echo "$MERGED"
if [ "$LOCAL_SIZE" != "" ] && [ "$REMOTE_SIZE" != "" ]; then

    LOCAL_WIDTH=`echo "$LOCAL_SIZE" | awk '{print $1}'`
    LOCAL_HEIGHT=`echo "$LOCAL_SIZE" | awk '{print $2}'`

    REMOTE_WIDTH=`echo "$REMOTE_SIZE" | awk '{print $1}'`
    REMOTE_HEIGHT=`echo "$REMOTE_SIZE" | awk '{print $2}'`

    DIFF_WIDTH=$(($REMOTE_WIDTH - $LOCAL_WIDTH))
    DIFF_HEIGHT=$(($REMOTE_HEIGHT - $LOCAL_HEIGHT))

    echo "   Local: ""$LOCAL_WIDTH""x""$LOCAL_HEIGHT""      Remote: ""$REMOTE_WIDTH""x""$REMOTE_HEIGHT""      Diff: ""$DIFF_WIDTH""x""$DIFF_HEIGHT"

fi
echo ""