Transform a picture to character painting

Study notes about a small program to transform a picture to character painting

PIL

The Python Imaging Library (PIL) adds image processing capabilities to your Python interpreter. This library supports many file formats, and provides powerful image processing and graphics capabilities.

Project description

Picture transfer to character painting.

  • Read the image
  • Resize picture
  • Use the grayscale value formula to map the RGB values of pixels to the grayscale values,
  • Print out character painting
from PIL import Image


ascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")


def getstr(r,g,b,alpha=256):
    ''' 
    make pixel to chars
    '''

    if alpha==0: 
        return ' '
    lens=len(ascii_char)

   
    gray=int(0.2126 * r + 0.7152 * g + 0.0722 * b)

    unit=257.0/lens
    char=ascii_char[int(gray/unit)]

    return char


picture_name=raw_input('please input picture name---->')
size=raw_input('please input size you want like 30x30 or enter to default---->')
a=size.split('x')
width=int(a[0]) if size else 40
height=int(a[1]) if size else 40


im=Image.open(picture_name)

im=im.resize((width,height),Image.NEAREST)


txt=''


for i in range(height):
    for j in range(width):
        txt+=getstr(*im.getpixel((j,i)))
       
    txt+='\n'

print txt
    
with open('output.txt','w') as e:
    e.write(txt)
    e.close()

input:

Hello-Kitty-Doctor-Who-Weeping-Angel-Die-Cut-Vinyl-Decal-PV1972.png

50x30 
output:

          '$$$'                  .$$$$$.
          $.  .$$$          $$.$$$.   Z$
          $       $$$$$$$$@$  $       ]$
          $.              $    $.$$   $$
          $$@             $    @   B$$$$$
         $$                 $$$$;$$.$   $
        $$                        $$  $$.
        $                          .$$  $
       d$                               $|
       $$                               $$+
     .$$$.      .@o           .$L       $)$w
     $W $$   `$"   @         $$  $$$   B$ $
    @.n ^@$  8     O$        $     W @$$ (a@$.
    $$ J$'$$$@I    $   %  U  $     &$$$$ $.B$.
    $$ $ $ $.$     $         &$     $*$ $$$$ $
     $p.$$$a$     $$$$$$$$$$$$$d     $   $.$$$
     t $$"w.$.  .$$'         .$$$    $ $ $$$>&
      C.$ $ta$$$$  .Q$$$$$$$$'  .$$$$$ u$$$$ @
    $ $h@ $ \ @$                 `$u $      ($
    $  z ;l$   $$$$$$O     :8$$$$$$'  x.$U@
    $  $ $ $  U$                  L$  $ -  $B.
     :$   $$  $.                   $X  $ $  $
     $ '$ 0. n$                    >$ .$ $  J
      o  $   $                      $' $ '.$
      .   +  $                      $@  $  I
          Q  $                      $$  $$!
            .$$$$ '             .?$$B
                  $$$$$$$$$$$$$$
May 8, 2017