By printing the same set of shots on each printer, labeling the backs, then shuffling the deck, I did a simple blind test.
Yearning to print the rumors but restrained by the law, the newspapers went the suggestion route, continually printing the same odd photograph of Prince Charles standing with another man in a field, without explaining why the photograph had any significance.
"The notion that broadcasters may distribute their content through radio, television, the Internet, mobile devices and other unforeseen portals, but must be prohibited by law from printing the same content on the medium of newsprint, seems anachronistic at best," Mr. McDowell said in a statement.
By printing the same image four ways -- as a halftone photolithograph, continuous tone photolithograph, photogravure and salt print -- the subtle shifts and changes that occur through these varied processes become evident.
In colour printing the same roll must move through as many printing units as there are colours used on each side of the paper.
For colour printing, the same roll of paper moves through several groups in succession, in each of which the plate cylinders carry typeforms appropriate for each of the colours necessary.
