On Sat, May 30, 2009 at 12:14:14PM -0600, David Green wrote: > On 2009-May-30, at 12:06 pm, David Green wrote: > >...what "Perl6" is today, let alone what it will be tomorrow. > > Actually, we do kind of know what Perl will look like a decade from > now, because P6 is deliberately extensible enough that we may never > need a Perl 7. But that simply means that holiday photos are already > a possibility: > > perl -MSteganography::Images pics/2009/ceylon.jpg > > In fact, you could do that in Perl 5....
Storing things in PNGs has already been done, badly, by Acme::Steganography::Image::Png :-) Well, badly as far as the "hiding" bit goes. The effectiveness of the Floyd- Steinberg dithering actually surprised me. There's "real" software to do real steganography within JPEGs, that I think stated that it managed to use up to 1 bit in 9 without being obvious. I think that you'd have to understand the JPEG file format to make it work effectively, and I didn't need to do that to prove my point. (Which was that a photo sharing site with no file quota was not a good idea as it could be abused by third parties to completely externalise their file distribution costs) Mmm, I realise that this also means that I've had a JPEG file on CPAN for 4 years now, and no-one has commented :-) Nicholas Clark
