4 ms·

Compress file A generated compressed file B. Compress file B fails to make it shorter, so the generated file C is actually identical to B. We’ve just compress

Compress file A generated compressed file B. Compress file B fails to make it shorter, so the generated file C is actually identical to B. We’ve just compressed twice. Uncompressing twice generates A again.

jonas21 5y ago
The problem is if you start with B. Then you compress it to get C. Since B == C, when you uncompress C, you get A, which is not what you started with.
detaro 5y ago
I'm talking about compressing/decompressing that once. Then input != output, thus it's not a working compression formally.