| In the original challenge the size limit is defined as what Twitter still allows you to send if you paste your text in their textbox and press "update" | On the right, Mona Lisa compressed down to 534 bytes using the method described here the bytes mentioned here refer to data bytes, therefore ignoring bits wasted by using Unicode characters : Edit : just replaced CJK text with the newest versions of the images |
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| Possibly augmenting the challenge to upload three images which when recombined give you a full colour image while still maintaining a monochrome version in each separate image | As some people correctly noticed this is different from what you could send as a SMS text message from your mobile |
| Uses only Unicode's Private User Areas• Images have been scaled up to approximately the same size for easy comparison | Pack the results into the UTF-16 characters• What is not explictily mentioned but what my personal rule was is that you should be able to select the tweeted message in your browser, copy it to the clipboard and paste it into a text input field of your decoder so it can display it |
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| Down-sample the image gray-scale such that there were a total of 16 different shades• Posting a Monochrome or Greyscale image should improve the size of the image that can be encoded into that space since you don't care about colour |
Edit : here is how the compression method compares with JPEG.