diff --git a/image_list.py b/image_list.py
index e3d9a38..bd1daa2 100755
--- a/image_list.py
+++ b/image_list.py
@@ -32,6 +32,8 @@ def setup_options():
                       help="Search list based on path pattern")
     parser.add_argument("--color",action="store_true",dest="colors",default=False,
                      help="Append list with mean color information This option will flip the 'Add new files' option. [%(default)s]")
+    parser.add_argument("--finger",action="store_true",dest="finger",default=False,
+                     help="Append list with fingerprint information. This option will flip the 'Add new files' option. [%(default)s]")
     parser.add_argument("--nearest",type=str,dest="nearestcolor",default=False,
                      help="Search list for nearest mean color. format: R,G,B in float 0-1. Add fourth value to limit search to number")
     parser.add_argument("--dup",action="store_true",dest="duplicate",default=False,
@@ -40,13 +42,15 @@ def setup_options():
                      help="Delete files listed with --small. [%(default)s]")
     parser.add_argument("--small",action="store_true",dest="searchsmall",default=False,
                      help="Return a list of small files, smaller than -m INT. This option will flip the 'Add new files' option. [%(default)s]")
+    parser.add_argument("--similar",type=int,dest="similarity",default=False,
+                     help="Search list for similar images. Value 0-255 for similarity threshold. 0=high similarity")
     parser.add_argument("-x",action="append",dest="exclude",default=[],
                      help="Exclude folder name from the lists. This option may be issued several times")
     parser.add_argument('startpath', action="store",default='.', nargs='?')
     
     options=parser.parse_args()
     BADDIRS.extend(options.exclude)
-    if options.duplicate or options.searchsmall or options.colors:
+    if options.duplicate or options.searchsmall or options.colors or options.finger:
         options.add=not options.add
     return options
 
@@ -56,7 +60,7 @@ def createdb(sqlfile):
     conn.text_factory=str
     db.execute('CREATE TABLE list (id INTEGER PRIMARY KEY AUTOINCREMENT,\
                file TEXT,date INTEGER,portrait NUMERIC, hash TEXT,\
-               width INTEGER,height INTEGER,\
+               width INTEGER,height INTEGER,fingerprint TEXT,\
                R REAL,G REAL, B REAL, BR REAL, BG REAL, BB REAL)')
     conn.commit() 
     return
@@ -261,6 +265,72 @@ def get_colors(filename):
     border=[float(i) for i in border.strip().strip('"').split(',')]
     return (mean,border)
 
+def append_fingerprints(sqlfile):
+    conn=sqlite3.connect(sqlfile)
+    conn.text_factory=str
+    db=conn.cursor()
+    dbh=conn.cursor()
+    db.execute("SELECT file FROM list WHERE fingerprint IS NULL ORDER BY file")
+    i=0
+    for row in db:
+        fp=get_fingerprint(row[0])
+        dbh.execute("UPDATE list SET fingerprint=? \
+               WHERE file=?",(fp,row[0]))
+        print " %(f)s" % {'f':row[0]}
+        i+=1
+        if (i%50==0):
+            conn.commit();
+    conn.commit()
+
+def get_fingerprint(filename):
+    small_args=['convert','-define','jpeg:size=256x256',filename+'[0]','-resize','160x160!',
+                '-colorspace','Gray','-blur','2x2','-normalize','-equalize','-resize','16x16','-depth','1','TEXT:-']
+    p=subprocess.Popen(small_args,stdout=subprocess.PIPE)
+    img, err = p.communicate()
+    values=''
+    for row in img.split('\n'):
+        gray=row.split(',')
+        if len(gray)<3:
+            continue
+        if gray[2]=="255":
+            values+='1'
+        else:
+            values+='0'
+    return str(int(values,2))
+
+def find_fingerprint_nearest(sqlfile,thr):
+    #   thr either file, or threshold?
+    conn=sqlite3.connect(sqlfile)
+    conn.text_factory=str
+    db1=conn.cursor()
+    db2=conn.cursor()
+    db1.execute("SELECT file,fingerprint,width,height FROM list ORDER BY file")
+    hits=[]
+    for i,hit1 in enumerate(db1):
+        if hit1[0] in hits:
+            continue
+        this=[hit1[0],'',sys.maxint,int(hit1[1]),hit1[2]*hit1[3]]
+        db2.execute("SELECT file,fingerprint,width,height FROM list ORDER BY file")
+        for hit2 in db2:
+            if hit2[0]==this[0]:
+                continue
+            similarity=bin(this[3]^int(hit2[1])).count('1')
+            if similarity<thr:
+                if similarity<this[2]:
+                    this[2]=similarity
+                    this[1]=hit2[0]
+                    if hit2[2]*hit2[3] < this[4]:
+                        foo=this[1]
+                        this[1]=this[0]
+                        this[0]=foo
+                    hits.append(hit2[0])
+        if this[2]<thr:
+            print('"%s" "%s"' % ( this[0], this[1] ))
+    #for row in hits:
+    #    print(row)
+            
+    return
+
 def searchdb(sqlfile,needle):
     conn=sqlite3.connect(sqlfile)
     conn.text_factory=str
@@ -346,8 +416,6 @@ def find_smalls(minsize,sqlfile):
     flist.append(('smalls',smalls))
     return flist
 
-
-
 def print_structure(files):
     for hash in files:
         #print(hash[0])
@@ -378,6 +446,9 @@ def main():
     if options.nearestcolor:
         find_color_nearest(options.sqlfile,options.nearestcolor)
         sys.exit(0)
+    if options.similarity:
+        find_fingerprint_nearest(options.sqlfile,options.similarity)
+        sys.exit(0)
     if options.delete:
         print('Deleting entries...') 
         delete_nonexisting(options.sqlfile)
@@ -387,6 +458,9 @@ def main():
     if options.colors:
         print('Adding colors...')
         append_colors(options.sqlfile)
+    if options.finger:
+        print('Adding fingerprints...')
+        append_fingerprints(options.sqlfile)
     if options.random:
         print('Random lists...')
         random_lists(options.sqlfile)