Photo CD in the late 90'
In the late 90’ you could purchase a whole encyclopedias on CD ROM. Optical discs replaced dozens of kilograms of printed paperand users could search by subject or keyword systems.
These devices were also considerably more efficient than the usual index which we fond in a printed volume. Similarly a Photo CD could store a hundred photographs. Each image contained in a Photo CD could have been printed and you will have not noticed differences between a traditional picture, printed by a minilab and that obtained from a digital file.
In fact, even though the digital technology might have seem very advantageous, the real problem was the final image’s quality. An ordinary photograph contains, generally, a amount of information that is equivalent to about twenty million points, each of which has its brightness and a certain color.
The electronic version of the same image should therefore consist of a 20 million pixel to get the same level of quality. In truth it takes less pixels because they contain more information than a silver halide grain Unfortunately sensors that could save this huge amount of information were not yet available to the general public but , even if they were, they should have downloaded an exorbitant amount of data into equally capable storage systems, for that years absolutely unsuitable for a consumer market