convert_palette.py

def nearest(pixel_color, mem={}):
    if pixel_color in mem:
        return mem[pixel_color]
    n = min(floss_palette, key=lambda fc:delta_e_cie2000(pixel_color, fc))
    mem[pixel_color] = n
    return mem[pixel_color]

result = [nearest(pixel_color) for pixel_color in image]

pillow_convert.py

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont

img = Image.new('RGB', (264, 176), color = (255, 255, 255))

font_path = '/usr/share/fonts/truetype/ubuntu/UbuntuMono-R.ttf'
font = ImageFont.truetype(font_path, 20)


draw = ImageDraw.Draw(img)
draw.text((15, 15), 'Is it your text?', font=font, fill=(0, 0, 0))

img.save('img_with_text.bmp', 'bmp')

pillow_dithering.py

from PIL import Image 
image_file = Image.open("cat-tied-icon.png") # open colour image
image_file = image_file.convert('1') # convert image to black and white
image_file.save('/tmp/result.png')

pillow_mask.py

from PIL import Image

col = Image.open('myimage.jpg')
gry = col.convert('L')
grarray = np.asarray(gry)
bw = (grarray > grarray.mean())*255
imshow(bw)

pillow_palette.py

#!/usr/bin/env python3
from PIL import Image

def quantizetopalette(silf, palette, dither=False):
    """Convert an RGB or L mode image to use a given P image's palette."""

    silf.load()

    # use palette from reference image
    palette.load()
    if palette.mode != "P":
        raise ValueError("bad mode for palette image")
    if silf.mode != "RGB" and silf.mode != "L":
        raise ValueError(
            "only RGB or L mode images can be quantized to a palette"
            )
    im = silf.im.convert("P", 1 if dither else 0, palette.im)
    # the 0 above means turn OFF dithering

    # Later versions of Pillow (4.x) rename _makeself to _new
    try:
        return silf._new(im)
    except AttributeError:
        return silf._makeself(im)

palettedata = [0, 0, 0, 102, 102, 102, 176, 176, 176, 255, 255, 255]
palimage = Image.new('P', (16, 16))
palimage.putpalette(palettedata * 64)
oldimage = Image.open("School_scrollable1.png")
newimage = quantizetopalette(oldimage, palimage, dither=False)
newimage.show()

split_image.py

import pandas as pd
import numpy as np
from PIL import Image
from PIL import ImageEnhance
import cv2

im = Image.open(path)

# Get np.array from image
im_array = np.asarray(im)

# Blur Image
blur = Image.fromarray(cv2.medianBlur(im_array,5))

# Enhance color for easier split
im_ready = ImageEnhance.Color(blur).enhance(100)

# Get unique colors from Image

unique_colors = set()
def get_unique_colors(img):
    for i in range(0,img.size[0]):
        for j in range(0,img.size[1]):
            r,g,b = img.getpixel((i,j))
            unique_colors.add((r,g,b))
    return(unique_colors)

unique_colors = get_unique_colors(im_ready)

# Create a dictionary computing each unique color frequency

from collections import defaultdict
by_color = defaultdict(int)
for pixel in im_ready.getdata():
    by_color[pixel] += 1

# Detect two most frequent colors that are not black 
# (black will always be sorted(by_color.values(),reverse=True)[0]  with over 10k black pixels)

colors_list = []
for e,j in by_color.iteritems():
    if j == sorted(by_color.values(),reverse=True)[1]:
        colors_list.append(e)
    if j == sorted(by_color.values(),reverse=True)[2]:
        colors_list.append(e)

def get_letter_order(im):
    impx = im.load()
    for x in range(0,im.size[0]):
        for y in range(0,im.size[1]):
            if impx[x,y] == colors_list[0]:
                return(colors_list[0],colors_list[1])
            if impx[x,y] == colors_list[1]:
                return(colors_list[1],colors_list[0])

first_letter_color, second_letter_color = get_letter_order(im_ready)

# Get each letter separately by replacing the other color with black pixels

l1 = im_ready.copy()
l2 = im_ready.copy()
im1 = l1.load()
im2 = l2.load()
for x in range(0,im_ready.size[0]):
    for y in range(0,im_ready.size[1]):
        if im_ready.getpixel((x,y)) <> (0,0,0):
            if im1[x,y] <> first_letter_color:
                im1[x,y] = (0,0,0)
            if im2[x,y] <> second_letter_color:
                im2[x,y] = (0,0,0)