add -s sharpness flag to counteract aliasing

banter.1

@@ -10,6 +10,7 @@
 .Nm
 .Op Fl d Ar delay
 .Op Fl w Ar width
+.Op Fl s Ar sharpness
 .Op Fl Fl colorfmt Ar format
 .Op Fl Fl filler Ar filler
 .Pa file
@@ -39,6 +40,14 @@ the
 of filler characters. the actual line will almost certainly
 be longer because of color codes.
 .
+.It Fl s Ar sharpness
+doubles the pixels to make edges sharper, however uses
+exponentially more ram.
+.Ar sharpness
+is
+.Cm 4
+by default and can be lowered to reduce ram usage.
+.
 .It Fl Fl colorfmt Ar format
 the unicode-escaped format of the colorcodes. you probably
 do not want to change it, the default of

banter.py

@@ -9,19 +9,19 @@ from PIL import Image, ImageOps
 from color import closestColor
 
 
-def main(imgPath,delay,ASCIIWIDTH,COLORCHAR,FILLER):
+def main(imgPath,delay,ASCIIWIDTH,COLORCHAR,FILLER,SHARPNESS):
     im = Image.open(imgPath, 'r')
-    im = ImageOps.scale(im, ASCIIWIDTH / im.width)
+    im = ImageOps.scale(im, ASCIIWIDTH*SHARPNESS / im.width)
     width, height = im.size
     pixel_values = list(im.getdata())
 
     currentPixel = 0
 
-    for y in range(0, height, 2):
+    for y in range(0, height, 2*SHARPNESS):
         line = []
         lastColor=69420
 
-        for x in range(width):
+        for x in range(0, width, SHARPNESS):
             color = closestColor(pixel_values[width*y+x])
             if color == lastColor:
                 colorcode = ''
@@ -41,6 +41,7 @@ if __name__ == "__main__":
     parser.add_argument("file")
     parser.add_argument("-d",metavar='delay',default=0)
     parser.add_argument("-w",metavar='width',default=80)
+    parser.add_argument("-s",metavar='sharpness',default=4)
     parser.add_argument("--colorfmt",metavar='format',default='\\x03{},{}')
     parser.add_argument("--filler",metavar='filler',default='.')
     args = parser.parse_args()
@@ -50,5 +51,6 @@ if __name__ == "__main__":
             float(args.d),
             int(args.w),
             args.colorfmt.encode().decode('unicode_escape'),
-            args.filler.encode().decode('unicode_escape')
+            args.filler.encode().decode('unicode_escape'),
+            int(args.s)
             )