71 lines
2.6 KiB
Python
71 lines
2.6 KiB
Python
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"""Convert GIFs to 360x360 for the JC3636W518 (round 360x360 display).
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Each frame is scaled so the GIF covers 360x360, then center-cropped. Frame durations and looping are kept.
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Pillow stores only the changed part of each frame, which keeps files small.
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Usage:
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pip install pillow
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python gif_to_360.py <input.gif or folder> [more ...] -o <output folder>
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The device stores one background GIF in an 11.5 MB flash area: bigger results are reported as too large.
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"""
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import argparse
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import os
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import sys
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from PIL import Image, ImageSequence
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SIZE = 360
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MAX_BYTES = 11_500_000
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def convert(src, dst):
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im = Image.open(src)
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w, h = im.size
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scale = max(SIZE / w, SIZE / h)
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nw, nh = max(SIZE, round(w * scale)), max(SIZE, round(h * scale))
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left, top = (nw - SIZE) // 2, (nh - SIZE) // 2
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frames, durations = [], []
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for frame in ImageSequence.Iterator(im):
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durations.append(frame.info.get("duration", im.info.get("duration", 100)) or 100)
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rgba = frame.convert("RGBA") # fully composited frame
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if (nw, nh) != (w, h):
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rgba = rgba.resize((nw, nh), Image.LANCZOS)
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rgba = rgba.crop((left, top, left + SIZE, top + SIZE))
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# the device shows the GIF on black: flatten transparency onto black
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bg = Image.new("RGBA", rgba.size, (0, 0, 0, 255))
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bg.alpha_composite(rgba)
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frames.append(bg.convert("RGB"))
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frames[0].save(dst, save_all=True, append_images=frames[1:], duration=durations,
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loop=im.info.get("loop", 0), optimize=True, disposal=1)
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size = os.path.getsize(dst)
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fps = len(durations) * 1000 / max(1, sum(durations))
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note = "" if size <= MAX_BYTES else " ** TOO LARGE for the device (max 11.5 MB) **"
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print(f"{os.path.basename(src)}: {w}x{h}, {len(frames)} frames, {fps:.1f} fps "
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f"-> {os.path.basename(dst)} {size / 1e6:.2f} MB{note}")
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def main():
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ap = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
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ap.add_argument("inputs", nargs="+", help="GIF files or folders")
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ap.add_argument("-o", "--out", required=True, help="output folder")
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args = ap.parse_args()
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os.makedirs(args.out, exist_ok=True)
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files = []
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for p in args.inputs:
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if os.path.isdir(p):
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files += [os.path.join(p, f) for f in sorted(os.listdir(p)) if f.lower().endswith(".gif")]
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else:
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files.append(p)
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if not files:
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sys.exit("no GIF files found")
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for f in files:
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name = os.path.splitext(os.path.basename(f))[0]
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convert(f, os.path.join(args.out, name + ".gif"))
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if __name__ == "__main__":
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main()
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