The example was made using the old algorithm of Magnifier.
The author of this tutorial is Gordon Sisson.
Mr. Sisson gladfully presents a story about a little man wishing to climb up the big spiral staircase. The tutorial demonstrates an enlargement application of AKVIS Magnifier plug-in version.
Gordon Sisson found an interesting picture in his clip art file of an oil storage tank with a striking view of the stairs climbing around the side. The picture was 300 dpi but the focus was a bit soft and it was only 1.4 inches wide. The author wanted it to be eight inches wide. See below how he did it.
The result is a notable improvement in clarity.