How does it work?
How does SilentEye embed data in BMP format ?
SEFormatBMP plug-in use LSB (Least Significant Bit) process in order to hide data into RGB representation of a pixel. Has Bitmap is not a compressed format there is no need to worry about losing information.
See also :
What does "distribution" means for SilentEye ?Distibution mode
What does "header" means for SilentEye ?
In order to determine how many bits have to be read from image, the embedded data size is compute and writen into media (32 bits are reserved for header). Header also contains data format (text, charset / file, filename).