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@mayjs
Created January 3, 2017 18:55
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Generate ASCII art from bitmaps in python
from PIL import Image
"""Credit: https://www.hackerearth.com/notes/beautiful-python-a-simple-ascii-art-generator-from-images/
One change: the scaled images width is doubled to create better ASCII art.
"""
ASCII_CHARS = [ '#', '?', '%', '.', 'S', '+', '.', '*', ':', ',', '@']
def scale_image(image, new_width):
"""Resizes an image preserving the aspect ratio.
"""
(original_width, original_height) = image.size
aspect_ratio = original_height/float(original_width)
new_height = int(aspect_ratio * new_width)
# This scales it wider than tall, since characters are biased
new_image = image.resize((new_width*2, new_height))
return new_image
def convert_to_grayscale(image):
return image.convert('L')
def map_pixels_to_ascii_chars(image, range_width=25):
"""Maps each pixel to an ascii char based on the range
in which it lies.
0-255 is divided into 11 ranges of 25 pixels each.
"""
pixels_in_image = list(image.getdata())
pixels_to_chars = [ASCII_CHARS[int(pixel_value/range_width)] for pixel_value in
pixels_in_image]
return "".join(pixels_to_chars)
def convert_image_to_ascii(image, new_width):
image = scale_image(image,new_width)
image = convert_to_grayscale(image)
pixels_to_chars = map_pixels_to_ascii_chars(image)
len_pixels_to_chars = len(pixels_to_chars)
image_ascii = [pixels_to_chars[index: index + new_width*2] for index in
range(0, len_pixels_to_chars, new_width*2)]
return "\n".join(image_ascii)
def handle_image_conversion(image_filepath,new_width=100):
image = None
try:
image = Image.open(image_filepath)
except Exception as e:
print("Unable to open image file {image_filepath}.".format(image_filepath=image_filepath))
print(e)
return
image_ascii = convert_image_to_ascii(image,new_width)
print(image_ascii)
return image_ascii
if __name__=='__main__':
import sys
image_file_path = sys.argv[1]
handle_image_conversion(image_file_path)
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