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import numpy as np
import cv2
from PIL import Image
def read_file(source_image, target_image):
s = cv2.cvtColor(source_image, cv2.COLOR_RGB2LAB)
t = cv2.cvtColor(np.array(target_image), cv2.COLOR_RGB2LAB)
return s, t
def get_mean_and_std(x):
x_mean, x_std = cv2.meanStdDev(x)
x_mean = np.hstack(np.around(x_mean,2))
x_std = np.hstack(np.around(x_std,2))
return x_mean, x_std
def color_transfer(source, target_image):
"""
The primary goal of this algorithm is to adjust the colors of the source image
such that its color distribution looks like the distribution of the target image.
"""
s, t = read_file(source, target_image)
s_mean, s_std = get_mean_and_std(s)
t_mean, t_std = get_mean_and_std(t)
height, width, channel = s.shape
for i in range(0,height):
for j in range(0,width):
for k in range(0,channel):
x = s[i,j,k]
x = ((x-s_mean[k])*(t_std[k]/s_std[k]))+t_mean[k]
# round or +0.5
x = round(x)
# boundary check
x = 0 if x<0 else x
x = 255 if x>255 else x
s[i,j,k] = x
s = cv2.cvtColor(s,cv2.COLOR_LAB2BGR)
cv2.imwrite('result.jpg',s)
def rgb_to_hex(rgb):
return '#{:02x}{:02x}{:02x}'.format(rgb[0], rgb[1], rgb[2])
def hex_to_rgb(hex):
hex = hex.lstrip('#')
return tuple(int(hex[i:i+2], 16) for i in (0, 2, 4))
def create_color_palette(colors, palette_width=800, palette_height=200):
"""
Receives a list of colors in hex format and creates a palette image
"""
pixels = []
n_colors = len(colors)
for i in range(n_colors):
color = hex_to_rgb(colors[i])
for j in range(palette_width//n_colors * palette_height):
pixels.append(color)
img = Image.new('RGB', (palette_height, palette_width))
img.putdata(pixels)
# img.show()
return img
# colors = ['#d54b18', '#555015', '#98680e', '#1f3919', '#da8007', '#a50637', '#b50406', '#d52350', '#e2090f', '#f8545c']
# img = create_color_palette(colors)
# color_transfer('s2', img)
def recolor(source, colors):
palette_img = create_color_palette(colors)
palette_bgr = cv2.cvtColor(np.array(palette_img), cv2.COLOR_RGB2BGR)
source_bgr = cv2.cvtColor(source, cv2.COLOR_RGB2BGR)
recolored = color_transfer(source_bgr, palette_bgr)
return recolored |