How to attach large info to a JPEG file?

The APP0 to APP15 markers only support 65535 bytes each (I read this from libjpeg.doc). What if there's a bigger chunk 开发者_运维技巧of data to save in the jpeg file?

There is no restriction on using multiple segments of the same type, depending on the data.

e.g, from Exif 2.2 specification, section 3.2

Compressed files can record extended data exceeding 64 Kbytes by dividing it into multiple APP2 segments.

Thats a lot of data.

Well if theres no other legit way then theres always steganography http://en.wikipedia.org/wiki/Steganography