Split:
The software splits a digital image to audio and visual files by a bitwise XOR operation (logical exclusive OR). The bitwise operation takes two bit patterns of equal length and performs exclusive OR on each pair of corresponding bits. The software makes random numbers. It is same numbers of pixels of the original image. A binary of the random number performs on a binary of the image by bitwise XOR. Bitwise XOR makes 0 and 0 to 0, 0 and 1 to 1, 1 and 1 to 0. But the position of the decimal does not change. If a binary of one pixel element is 10010011 and random number is 00100001, the result will be 10110010. See the example of 8 bits binary. It is same length of a color data element.

10010011 (original image)
00100001 (random number)

10110010 (the result)

Audio and Visual:
The software converted the random number data to musical notes by Kenji Kojima's RGB Music technology. RGB value 120 is converted to middle C. Each two step values increase or decrease a half tone. One pixel make three notes of harmony. 0,0,0 is no sounds. The note length is determined by the color value. The music is a twelve-tone music. The left sample MIDI file was created from the musical notes of the random numbers. You can listen it. The result of the image would be a new image which processed by bitwise XOR. The perception of human being could not recognize what the image was. We have 2 digital files as audio and visual. You can think that the audio is a key and the visual is a cipher image.

Merge:
The software converts an audio key (music file) to musical notes then makes binary. The binary performs on the binary of cipher image (visual) by bitwise XOR. See the example.

10110010 (split image)
00100001 (split audio key)

10010011 (same binary of the original)

The audio and visual files merge into an original image.