mirror of
https://gitlab.com/xCrystal/pokecrystal-board.git
synced 2024-09-09 09:51:34 -07:00
77 lines
2.2 KiB
Python
Executable File
77 lines
2.2 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
Usage: python palfix.py image.png
|
|
|
|
Fix the palette format of the input image. Colored images (Pokémon or trainer
|
|
sprites) will become indexed, with a palette sorted {white, light color, dark
|
|
color, black}. Grayscale images will become two-bit grayscale.
|
|
"""
|
|
|
|
import sys
|
|
|
|
import png
|
|
|
|
def rgb8_to_rgb5(c):
|
|
r, g, b = c
|
|
return (r // 8, g // 8, b // 8)
|
|
|
|
def rgb5_to_rgb8(c):
|
|
r, g, b = c
|
|
return (r * 8 + r // 4, g * 8 + g // 4, b * 8 + b // 4)
|
|
|
|
def invert(c):
|
|
r, g, b = c
|
|
return (31 - r, 31 - g, 31 - b)
|
|
|
|
def luminance(c):
|
|
r, g, b = c
|
|
return 0.299 * r**2 + 0.587 * g**2 + 0.114 * b**2
|
|
|
|
def rgb5_pixels(row):
|
|
yield from (rgb8_to_rgb5(row[x:x+3]) for x in range(0, len(row), 4))
|
|
|
|
def is_grayscale(palette):
|
|
return (palette == ((31, 31, 31), (21, 21, 21), (10, 10, 10), (0, 0, 0)) or
|
|
palette == ((31, 31, 31), (20, 20, 20), (10, 10, 10), (0, 0, 0)))
|
|
|
|
def fix_pal(filename):
|
|
with open(filename, 'rb') as file:
|
|
width, height, rows = png.Reader(file).asRGBA8()[:3]
|
|
rows = list(rows)
|
|
b_and_w = {(0, 0, 0), (31, 31, 31)}
|
|
colors = {c for row in rows for c in rgb5_pixels(row)} - b_and_w
|
|
if not colors:
|
|
colors = {(21, 21, 21), (10, 10, 10)}
|
|
elif len(colors) == 1:
|
|
c = colors.pop()
|
|
colors = {c, invert(c)}
|
|
elif len(colors) != 2:
|
|
return False
|
|
palette = tuple(sorted(colors | b_and_w, key=luminance, reverse=True))
|
|
assert len(palette) == 4
|
|
rows = [list(map(palette.index, rgb5_pixels(row))) for row in rows]
|
|
if is_grayscale(palette):
|
|
rows = [[3 - c for c in row] for row in rows]
|
|
writer = png.Writer(width, height, greyscale=True, bitdepth=2, compression=9)
|
|
else:
|
|
palette = tuple(map(rgb5_to_rgb8, palette))
|
|
writer = png.Writer(width, height, palette=palette, bitdepth=8, compression=9)
|
|
with open(filename, 'wb') as file:
|
|
writer.write(file, rows)
|
|
return True
|
|
|
|
def main():
|
|
if len(sys.argv) < 2:
|
|
print(f'Usage: {sys.argv[0]} pic.png', file=sys.stderr)
|
|
sys.exit(1)
|
|
for filename in sys.argv[1:]:
|
|
if not filename.lower().endswith('.png'):
|
|
print(f'{filename} is not a .png file!', file=sys.stderr)
|
|
elif not fix_pal(filename):
|
|
print(f'{filename} has too many colors!', file=sys.stderr)
|
|
|
|
if __name__ == '__main__':
|
|
main()
|