Created
November 3, 2025 10:16
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Convert Danbooru posts (by ID) to Sixel format
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| #!/usr/bin/env python3 | |
| import sys | |
| import math | |
| import io | |
| import requests as re | |
| from itertools import groupby | |
| from PIL import Image | |
| if len(sys.argv) != 2: | |
| print(f"Usage: {sys.argv[0]} <post ID>") | |
| exit(1) | |
| post_url = re.get(f"https://danbooru.donmai.us/posts/{sys.argv[1]}.json", params={ "only": "file_url"}) | |
| if post_url.status_code != 200: | |
| print(f"API error {post_url.status_code}") | |
| exit(1) | |
| post_data = re.get(post_url.json()["file_url"], stream=True) | |
| if post_data.status_code != 200: | |
| print(f"Download error {post_data.status_code}") | |
| exit(1) | |
| img = Image.open(post_data.raw) # type: ignore | |
| img = img.convert(mode="P", palette=Image.Palette.ADAPTIVE, dither=Image.Dither.FLOYDSTEINBERG) | |
| w, h = img.size | |
| sixel_string = io.StringIO() | |
| # Start Sixel mode | |
| sixel_string.write("\x1bPq") | |
| # Write palette | |
| assert img.palette is not None | |
| for color, index in img.palette.colors.items(): | |
| r, g, b = color | |
| r = round(r * (100 / 255)) | |
| g = round(g * (100 / 255)) | |
| b = round(b * (100 / 255)) | |
| sixel_string.write(f"#{index};2;{r};{g};{b}") | |
| img_data = img.tobytes() | |
| for row in range(math.ceil(h / 6)): | |
| y = row * 6 | |
| sixels = [0] * w * 256 | |
| for x in range(w): | |
| for i in range(6): | |
| if y + i >= h: | |
| break | |
| sixels[(img_data[((y + i) * w) + x] * w) + x] |= (1 << i) | |
| for i in range(256): | |
| chunk = sixels[i * w : (i + 1) * w] | |
| if not any(chunk) and i != 255: | |
| continue | |
| row = f"#{i}" | |
| for k, g in groupby(chunk): | |
| count = len(list(g)) | |
| if count > 1: | |
| row += f"!{count * 2}{chr(k + 63)}" | |
| else: | |
| row += chr(k + 63) * count * 2 | |
| if i == 255: | |
| row += "-" | |
| else: | |
| row += "$" | |
| sixel_string.write(row) | |
| # End Sixel mode | |
| sixel_string.write("\x1b\\") | |
| full_string = sixel_string.getvalue() | |
| # print(f"{len(full_string)} characters") | |
| print(full_string) |
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