Learn how to generate ASCII art from the image using Python.
Generated in Python
Steps to convert image to ASCII character
- Load an image
- Resize Image
- Convert image to GreyScale
- Convert GreyScale data of each pixel into respective ASCII character
Loading an Image using PIL image Library
To load the image we will be using PIL library.
import PIL.Imagedef main(): path = input(“Enter the path to the image fiel : n”) try: image = PIL.Image.open(path) except: print(path, “Unable to find image “);
The above code read the image from the path given by the user. If the image doesn?t exist on the given path then, we will show an error message.
Define ASCII list
Let?s create a list of ASCII characters,
ASCII_CHARS = [“@”, “#”, “$”, “%”, “?”, “*”, “+”, “;”, “:”, “,”, “.”]
The ASCII characters are arranged from the darkest to the lightest. This means the darkest pixel will be replaced with @ and lightest with .
We need to convert the image to some small width and height so that it doesn?t result in large size text. To find the new_height, multiply new_width with old_height then divide by old_width.
def resize(image, new_width = 100): width, height = image.size new_height = new_width * height / width return image.resize((new_width, new_height))
Convert Image to GreyScale
We can use convert method on image with L option to get GreyScale image
def to_greyscale(image): return image.convert(“L”)
Convert GreyScale Image to ASCII character
To convert the image to ASCII character first, get each pixel value(0-255). Get the corresponding ASCII character and join them as a string
def pixel_to_ascii(image): pixels = image.getdata() ascii_str = “”; for pixel in pixels: ascii_str += ASCII_CHARS[pixel//25]; return ascii_str
Now we have a to_greyscale method to convert image to GreyScale image, pixel_to_ascii method to convert GreyScale image to ASCII string, once we get the ASCII string of the image we need to split the string based on the width of the image and save it in a file
import PIL.Imagedef main(): path = input(“Enter the path to the image fiel : n”) try: image = PIL.Image.open(path) except: print(path, “Unable to find image “) #resize image image = resize(image); #convert image to greyscale image greyscale_image = to_greyscale(image) # convert greyscale image to ascii characters ascii_str = pixel_to_ascii(greyscale_image) img_width = greyscale_image.width ascii_str_len = len(ascii_str) ascii_img=”” #Split the string based on width of the image for i in range(0, ascii_str_len, img_width): ascii_img += ascii_str[i:i+img_width] + “n” #save the string to a file with open(“ascii_image.txt”, “w”) as f: f.write(ascii_img);main()