Suppose that you wanted to take this map of the T (the Boston subway system) and put it on your mobile device. For this example, we will assume that you want to stay within the 150-pixel screen size limit to support older Palm OS devices.

Image Copyright 1999 by the Massachusetts Bay Transit Authority. Not to be reproduced without express written consent from the MBTA.

The first thing you would do, of course, is convert it to grayscale and posterize it down to a 4-gray image so that it will not dither on a 4-gray device like a Palm III.

Right now, the image is 381x426 pixels—that is way over our 150-pixel in either dimension limit, so you are going to have to shrink it down (and if you do not, your M-Business Sync Server will do it for you). This means you will end up with a 134x150 graphic that looks something like this.

This clearly is not good. None of the station names in the image are readable.