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SGM Palettized Image Creator
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import argparse | |
from PIL import Image, ImageChops, ImageMath | |
def create_sprite(name, width=-1, differentiator='RGB', fallback=False): | |
''' | |
Generates a palettized image from input images in the same folder. | |
The inputs can be: raw image, base colors, color map, and detail layer | |
or: shadows, highlights, color map, and detail layer. | |
Parameters: | |
- name | |
base name of input files | |
- width | |
<0: downscale such that diagonal is ~666 (preserve size if original diagonal is <666) | |
=0: preserve size | |
>0: resize to specified width | |
- differentiator | |
='R': only consider the red channel when making the color map | |
='RGB': differentiate all colors when making the color map | |
- fallback | |
True: run with color map in palette mode | |
False: run normally with color map unmodified | |
''' | |
area = Image.open(name + '_area.png').convert('RGBA') # color map | |
if fallback: | |
area = area.convert('P').convert('RGBA') | |
line = Image.open(name + '_line.png').convert('RGBA') # detail layer | |
try: | |
shadow = Image.open(name + '_shadow.png').convert('RGBA') | |
highlight = Image.open(name + '_highlight.png').convert('RGBA') | |
except: | |
raw = Image.open(name + '_raw.png').convert('RGBA') # raw image | |
base = Image.open(name + '_base.png').convert('RGBA') # base colors | |
shadow = ImageChops.subtract(base, raw) | |
highlight = ImageChops.subtract(raw, base) | |
if differentiator == 'R': | |
r = area.getchannel(0).convert('L') | |
elif differentiator == 'RGB': | |
copy = Image.new('RGB', area.size) | |
copy.paste(area, mask=area) # paste removes color info in transparent areas | |
data = copy.getdata() | |
colors1 = {(a, b, c, 0) for a, b, c in data} - {(0, 0, 0, 0)} | |
colors2 = set() | |
colormap = {0: (0, 0, 0)} | |
while len(colors1) > 0 and len(colormap) < 256: | |
for a, b, c, d in colors1: | |
if a not in colormap: | |
colormap[a] = ((a - d) % 256, b, c) | |
else: | |
colors2.add(((a + 1) % 256, b, c, d + 1)) | |
colors1 = colors2.copy() | |
colors2.clear() | |
if len(colors1): | |
print('Color limit exceeded; colors excluded:', colors1) | |
print('Trying again with color map in palette mode.') | |
return create_sprite(name, width, differentiator, True) | |
colormapinverse = {colormap[i]: i for i in colormap} | |
rdata = [colormapinverse[i] for i in data] | |
r = Image.new('L', area.size) | |
r.putdata(rdata) | |
else: | |
print('Unsupported differentiator:', differentiator) | |
return | |
g = ImageMath.eval('convert(0xff - line, "L")', line=line.getchannel(3).convert('L')) | |
b = ImageMath.eval( | |
'convert(0xff - (area > 0) * (shadow * (0xff - 0x33) / 0x80) + (area > 0) * ((highlight - 0x33) * 0x33 / 0x40), "L")', | |
area=area.convert('L'), | |
shadow=shadow.convert('L'), | |
highlight=highlight.convert('L') | |
) | |
if width < 0: | |
diagonal = 666 | |
area_diagonal = (area.width ** 2 + area.height ** 2) ** 0.5 | |
width = min(area.width, int(area.width * diagonal / area_diagonal)) | |
newsize = tuple(int(x * width / area.width) for x in area.size) | |
rgb = Image.merge('RGB', ( | |
r if width == 0 else r.resize(newsize, Image.NEAREST), | |
g if width == 0 else g.resize(newsize), # set resample to Image.NEAREST if area has gaps | |
b if width == 0 else b.resize(newsize) | |
)) | |
rgb.save(name + '.png') | |
if __name__ == '__main__': | |
parser = argparse.ArgumentParser() | |
parser.add_argument('-n', '--name', type=str, help='base name') | |
parser.add_argument('-w', '--width', type=int, default=-1, help='width (px)') | |
parser.add_argument('-d', '--differentiator', type=str, default='RGB', help='differentiator (R or RGB)') | |
args = parser.parse_args() | |
create_sprite(args.name, args.width, args.differentiator) |
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Moved to: https://github.com/Krazete/sgmpalette/blob/master/create_sprite.py