4 ms·

Aren't JPEG's lossy? I can't think of a reliable and performant way of retrieving data from a JPEG.

• oh_sigh 9y ago
  On compression yes but you can craft a jpeg image which has exactly the pixel data you need. It will fail if someone recompresses your image, but that would be unlikely
  • jpttsn 9y ago
    Not unlikely at all, if you're going to post it on social media
  • dheera 9y ago
    Twitter recompresses images, as do most networks.
• Dylan16807 9y ago
  Two or three bits per pixel, grayscale, should be quick and pretty resilient. A hundred kilobytes or more is easy to transfer.
  • flashmob 9y ago
    Or, how about a QR code?
    • Dylan16807 9y ago
      If you want absolutely terrible density, sure. Still beats 140 characters.