Although the effects are astounding, pencil-based art is more expensive and time consuming to reproduce. When photocopied, the result is a grainy black and white appearance and the detail and depth is lost. The appropriate way to reproduce pencil art is through a process known as half tone. Half tone is a form of PMT using a gray-tone screen to recreate the gray shades in a series of dots. The number of dots determines the amount of detail retained.
Resolution is measured by the number of dots per line.
An 85-line screen is most suitable for interior art reproduction. It prepares pencil illustrations for photocopying. The photocopier no longer recognizes the work as line art. The dot pattern is recognized and reproduced in exact. Most print shops are unable to create a four color print.