|The Pictographer's Shop|
To print continuous tone images, such as photographs, using black-and-white printing, some form of shading technique is needed. Nowadays, halftoning is the most common method. If you look very closely at a half-toned image, you'll see that it is composed of dots of solid color on a grid. The illusion of gray is created by varying the size of the dots. If the grid is fine enough (or the observer is far enough away), the observer's eye is fooled into seeing shades of gray, rather than a grid of dots.
For most desktop publishers, this process doesn't require much attention from the document designer. It's just one of the things the printing software does. However most illustration, photo manipulation and page layout programs do give you some control over the halftoning process for them that wants it. Of course, Photoshop lets you control your halftones, so let's have some fun!
If we make our halftone using lines of varying thickness instead of dots of varying radii, we get stripes. Adding a little wiggle to those stripes with Photoshop's Wave... filter gets us zebra stripes or flames.
Here's a little puzzle for you: what did I do to the linear gray ramp to bow the stripes? Send me email.
With a little more work (and a friend with a nice picture of her legs), you can create images like this:
Edited 8 Jan 2004 by John D. Corbett
Copyright © 2004 John D. Corbett