Adding a new script to the Python Script series. In this article we will see how to convert the colored image to ASCII art.
You will need to install
pillow python package. It is recommended that you create a virtual environment using python3 if not created already.
Once virtual environment is activated use command
pip install pillow to install the package.
We are performing below actions to generate the ascii art from image.
- Get an image path as command line argument.
- Open the image from provided path.
- Calculate the aspect ratio.
- Resize the image. Here we are taking new width as 120 pixels. Adjusting the new height as per aspect ratio.
- Convert the image into greyscale format.
- Get all the pixels of image. Replace pixles with intentsity in a defined range with a character from list.
- Print image and save to text file.
from PIL import Image
# pass the image as command line argument
image_path = sys.argv
img = Image.open(image_path)
# resize the image
width, height = img.size
aspect_ratio = height/width
new_width = 120
new_height = aspect_ratio * new_width * 0.55
img = img.resize((new_width, int(new_height)))
# new size of image
# convert image to greyscale format
img = img.convert('L')
pixels = img.getdata()
# replace each pixel with a character from array
chars = ["B","S","#","&","@","$","%","*","!",":","."]
new_pixels = [chars[pixel//25] for pixel in pixels]
new_pixels = ''.join(new_pixels)
# split string of chars into multiple strings of length equal to new width and create a list
new_pixels_count = len(new_pixels)
ascii_image = [new_pixels[index:index + new_width] for index in range(0, new_pixels_count, new_width)]
ascii_image = "\n".join(ascii_image)
# write to a text file.
with open("ascii_image.txt", "w") as f:
If you are getting an elongated image in terminal, you can adjust the height accordingly. I am generating
new_height using formula
new_height = aspect_ratio * new_width * 0.55.
list(img.getdata()) returns the list intensity of all pixels. Value of intensity will be between 0 to 255. Lower the value, darker the color. That is why we have characters in char list arranged from higher intensity to lower intensity.
pixel//25 , where 25 is the intensity range for one character, can be between 0 to 11 i.e why there are 11 characters in
chars list. You may keep more characters in list, lets say 16 characters and then keep the range size as 17.
new_pixels = [chars[pixel//25] for pixel in pixels] replaces the pixels with intensity from 0 to 25 with first character from
chars list and 26 to 50 with seconds character from
chars list and so on.
In the last lines we break the string into a matrix and print it.
How to use script: