05-11-2019, 02:31 PM
(This post was last modified: 05-11-2019, 02:39 PM by TheSeekersLighthouse.)
Bit of a random discussion.
Amazing really. Always had a bit of fun with technology. I found you could fit a compressed LOO book I EPUB onto 3 pages (if printed at 600dpi), or on 7 pages at 200 DPI. The 200 DPI setting was able to be scanned back into a file with no errors using a scanner. The 600dpi setting needed a scanner better than mine to resolve the fine dots.
The printed pages look like an extremely complex QR code: https://ibb.co/ctwHRKq. It prints out a compressed version of the data, and some Parity data, so it can reconstruct 'bad' areas. ECC is used on all data that you know today, be it a CD / HDD / USB key, and its how minor read errors are not shown to the end user, and also how dying media will seem to work with no problems, until bam errors that are too much for the ECC to correct. This writes additional parity data to supplement that, to take into account how crap consumer printers and scanners can be at resolving extremely fine dots.
Amazing, to fit the entire LOO book onto a mere 7 pages. You can fit it onto a single page if you remove the parity data and increase DPI to maximum and use larger paper sheets, but this is not advisable as without the parity data, the chances of the average domestic scanner reproducing it is quite low.
Not of much practical use, but was a fun project.
You can do this with other files, such as image files and documents. I would not advise this for long term storage of these, safer to print them as text or pictures, but done correctly can fit an entire word document to a single page, even though the document may be far longer.
In theory, good quality paper and pigment ink would last probably longer than we would. Though you have M-Disc disks for that, and the printed word/photo with proper pigment ink.
Just a random discussion I thought id post
Amazing really. Always had a bit of fun with technology. I found you could fit a compressed LOO book I EPUB onto 3 pages (if printed at 600dpi), or on 7 pages at 200 DPI. The 200 DPI setting was able to be scanned back into a file with no errors using a scanner. The 600dpi setting needed a scanner better than mine to resolve the fine dots.
The printed pages look like an extremely complex QR code: https://ibb.co/ctwHRKq. It prints out a compressed version of the data, and some Parity data, so it can reconstruct 'bad' areas. ECC is used on all data that you know today, be it a CD / HDD / USB key, and its how minor read errors are not shown to the end user, and also how dying media will seem to work with no problems, until bam errors that are too much for the ECC to correct. This writes additional parity data to supplement that, to take into account how crap consumer printers and scanners can be at resolving extremely fine dots.
Amazing, to fit the entire LOO book onto a mere 7 pages. You can fit it onto a single page if you remove the parity data and increase DPI to maximum and use larger paper sheets, but this is not advisable as without the parity data, the chances of the average domestic scanner reproducing it is quite low.
Not of much practical use, but was a fun project.
You can do this with other files, such as image files and documents. I would not advise this for long term storage of these, safer to print them as text or pictures, but done correctly can fit an entire word document to a single page, even though the document may be far longer.
In theory, good quality paper and pigment ink would last probably longer than we would. Though you have M-Disc disks for that, and the printed word/photo with proper pigment ink.
Just a random discussion I thought id post
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