diff --git a/imagegenerator/generate.py b/imagegenerator/generate.py
index 5ae8772..a17d190 100644
--- a/imagegenerator/generate.py
+++ b/imagegenerator/generate.py
@@ -11,9 +11,10 @@ parser.add_argument('filename')           # positional argument
 parser.add_argument('-o', '--output')      # option that takes a value
 parser.add_argument('-f', '--format', choices=['firmware','nodered','nodered_int'], default='firmware', help='Output format')      # option that takes a value
 parser.add_argument('-v', '--verbose', action='store_true')  # on/off flag
+parser.add_argument('-i', '--invert', action='store_true')
 
 args = parser.parse_args()
-print(args.filename, args.output, args.format,args.verbose)
+print(args.filename, args.output, args.format,args.verbose,args.invert)
 
 
 im = Image.open(args.filename) # Can be many different formats.
@@ -73,6 +74,9 @@ with open('result.txt', 'w') as f:
         columnValue=0
         for y in reversed(range(im.size[1])):
             c = pix[x,y] #get pixel
+            if args.invert:
+                c=255-c
+                
             if (c[0]>127):
                 if output_col_write_binary_flag:
                     f.write("1")