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November 23, 2018 11:33
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Generate and show a palette from the current image, video or camera
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from PIL import Image, ImageDraw | |
import cv2 | |
import numpy as np | |
import os | |
import sys | |
if len(sys.argv) < 2: | |
print("Needs file path ") | |
sys.exit(1) | |
fn = sys.argv[1] | |
if fn == "0": | |
fn = 0 | |
else: | |
if not os.path.exists(fn): | |
print("Invalid path") | |
sys.exit(1) | |
cap = cv2.VideoCapture(fn) | |
while True: | |
ret, frame = cap.read() | |
rgbimg = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB) | |
img = Image.fromarray(rgbimg) | |
if fn != 0: | |
img = img.resize((img.width//2, img.height//2)) | |
pal = img.convert('P', palette=Image.ADAPTIVE, colors=6) | |
pal.putalpha(0) | |
# pal.show() | |
colors = pal.getcolors(16*10**5) | |
colors = [c[1][:3] for c in colors] | |
colors = sorted(colors) | |
palheight = int(img.height*0.1) | |
palwidth = img.width | |
palimg = Image.new("RGB", (palwidth, palheight), "#000000") | |
draw = ImageDraw.Draw(palimg) | |
x = y = 0 | |
shift = palwidth//len(colors) | |
for c in colors: | |
draw.rectangle([x,y, x+shift, y+palheight], fill=c) | |
x+= shift | |
# palimg.show() | |
newimg = Image.new("RGB", (img.width, img.height+palheight), "#000000") | |
newimg.paste(img, (0,0)) | |
newimg.paste(palimg, (0, img.height)) | |
cimg = cv2.cvtColor(np.array(newimg), cv2.COLOR_RGB2BGR) | |
cv2.imshow("Palette Gen", cimg) | |
# break | |
if cv2.waitKey(1) == 27: | |
break | |
cap.release() | |
cv2.destroyAllWindows() |
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