What's the idea behind the encoding?  If it's that you can't/don't want to store binary data directly, you could try ASCII85/Base85 encoding, which uses 85 "printable" characters (instead of 64), and thus is slightly more compact (25% (base85) vs. 33% (base64) larger than the binary input).  Otherwise, I don't see many possibilities to significantly compress your ascii-fied image data any further, as the original JPG input already is compressed...

Note that there are several slightly different versions of ASCII85.  A CPAN search shows the related Perl module Math::Base85 which implements the RFC 1924 variant. Implementations of the Adobe variant might be found in the respective PDF/PS modules, though PDF::API2::Basic::PDF::ASCII85Decode seems to provide decoding only...

Update: FWIW, Nicholas Clark seems to have written such a module. Does anyone happen to know if/under what name that ended up on CPAN?

In reply to Re: encode/decode images by almut
in thread encode/decode images by Anonymous Monk

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