Merge pull request #1724 from aryanrai2001/Custom-CharRamps-For-PhotoToASCII

Add Character Sequence Selection in Photo To ASCII

Author: Yashbhadiyadra

Photo To Ascii/photo_to_ascii.py

@@ -1,61 +1,103 @@
 from PIL import Image, ImageEnhance
 
 # ASCII characters used to build the output text
-CHARS = "00011111..."
+char_ramp = []
+
+# Choose character sequence for mapping
+def set_char_ramp():
+    global char_ramp
+    print("Choose a Character Sequence!")
+    print("1 - Basic")
+    print("2 - Standard (Short)")
+    print("3 - Standard (Long)")
+    print("4 - Unicode Blocks")
+    print("5 - Unicode Shades")
+    print("6 - Enter Custom Sequence")
+    choice = input("Input: ")
+
+    try:
+        choice = int(choice)
+    except Exception:
+        print("Invalid Input!")
+        exit()
+
+    if choice == 1:
+        char_ramp = list("00011111...")
+    elif choice == 2:
+        char_ramp = list("@%#*+=-:. ")
+    elif choice == 3:
+        char_ramp = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\\|()1}{[]?-_+~<>i!lI;:,\"^`'. ")
+    elif choice == 4:
+        char_ramp = ["█", "▉", "▊", "▋", "▌", "▍", "▎", "▏"]
+    elif choice == 5:
+        char_ramp = ["█", "▓", "▒", "░", " "]
+    elif choice == 6:
+        custom_ramp = input("Enter your Character Sequence from High density to Low: ")
+        if len(custom_ramp) == 0:
+            print("Invalid Input!")
+            exit()
+        char_ramp = list(custom_ramp)
+    else:
+        print("Invalid Input!")
+        exit()
+
 
 # Convert pixels to a string of ASCII characters
 def pixels_to_ascii(image, contrast_factor):
     image = image.convert("L")
     enhancer = ImageEnhance.Contrast(image)
     image = enhancer.enhance(contrast_factor)
     pixels = image.getdata()
-    characters = " ".join([CHARS[int((pixel/256)*len(CHARS))] for pixel in pixels])
+    characters = " ".join([char_ramp[int((pixel/256)*len(char_ramp))] for pixel in pixels])
     return(characters)
 
+# Driver function
 def photoascii():
     # Attempt to open image file from user-input
     path = input("Enter a valid pathname to an image:\n")
     try:
         image = Image.open(path)
     except Exception:
         print("Invalid Path!")
-        return
+        exit()
 
     contrast_factor = input("Enter contrast factor (1 = Original Contrast) [Note: Enter negative value to invert output] : ")
     try:
         contrast_factor = float(contrast_factor)
     except Exception:
         print("Invalid Input!")
-        return
-
+        exit()
+    
+    set_char_ramp()
+    
     if contrast_factor < 0:
-        global CHARS
-        CHARS = CHARS[::-1]
+        global char_ramp
+        char_ramp.reverse()
         contrast_factor = -contrast_factor
-
+    
     # Fetch the name of the image file
     dot_index = path.rfind('.')
     slash_index = path.rfind('\\')
     if slash_index == -1:
         slash_index = path.rfind('/')
     image_name = path[slash_index+1:dot_index] + "_" + path[dot_index+1:]
-
+    
     # Resize image
     new_width = 100
     width, height = image.size
     ratio = height/width
     new_height = int(new_width * ratio)
     resized_image = image.resize((new_width, new_height))
-
+    
     # Convert image to ASCII
     new_image_data = pixels_to_ascii(resized_image, contrast_factor)
     pixel_count = len(new_image_data)
     scanline_width = new_width * 2;
     ascii_image = "\n".join([new_image_data[index:(index+scanline_width)]
                             for index in range(0, pixel_count, scanline_width)])
-
+    
     # Save result to text file
-    with open(path[:slash_index] + "/{}_ASCII.txt".format(image_name), "w") as f:
+    with open(path[:slash_index] + "/{}_ASCII.txt".format(image_name), "w", encoding='utf8') as f:
         f.write(ascii_image)