Turn PNG files into PUZZLESCRIPT format quickly

pzr.py

def addUnique(l,item):
	if item not in l:
		l.append(item)
	return l

from PIL import Image
import sys
im = Image.open(sys.argv[1])
pix = im.load()

#first create the legend
# Creates a list containing 5 lists initialized to 0
out_l_l = [[0 for x in range(im.size[0])] for x in range(im.size[1])] 
col_set = []

for j in range(im.size[0]):
	for i in range(im.size[1]):
		r, g, b, a = pix[i,j]
		curPixel = '#%02x%02x%02x' % (r, g, b)
		if a != 0:
			addUnique(col_set, curPixel)

line = ""
for item in col_set:
	line += item + " "
print line

for j in range (im.size[0]):
	line = ""
	for i in range (im.size[1]):
		r,g,b,a = pix[i,j]
		if (a == 0):
			line += "."
		else:
			curPixel = '#%02x%02x%02x' % (r, g, b)
			line += str(col_set.index(curPixel))
	print(line)

hi is there a gui/way to get image into https://www.puzzlescript.net format (I dont know py)?