convert shika.jpg -modulate 100,0 -ordered-dither o8x8 -scale 2% -scale 10000% output.jpg

Image magickホント便利

https://cdn.nostrcheck.me/4bcc022810a7eff571f1a02024cf3a835c795af109b4ecab11e45062299141d7/7f96e227fc29cee88d0cd0309e72ef2f8af8e91b5dce16dc694b4c51cd8b1629.webp