Apple's iPhone
is 320x480 and some Smartphones now sport a VGA resolution of 480x640 pixels
(refer to the following figure). Within two years, mobiles may touch our current
desktop resolutions.
Chapter 3
[ 45 ]
While the resolution is growing, the absolute screen size is not. Even if you have more
pixels to play with, you only have 3 to 5 inches. Mobiles are also typically used at a
hand's distance; something too small may not be usable. Mobile devices are normally
taller than they are wide, and horizontal scrolling is not supported on some
devices??”so if the width of application is more than the device size, part of the
application will not be shown. 150 pixels is a safe width for today, but you should
check the target customers and the kind of device they will be using before making
a decision.
Colors, Images, Page Sizes, and More
Expect at least 256 colors on a mobile device. Most mobiles support images
well??”GIF and JPG are universal. As the RAM and processor capabilities are limited,
many devices keep a limit on the total size of a page??”including WCSS, XHTML MP,
and images. 10 kilobytes is the minimum you can expect, but it's best to keep the
page sizes as small as possible??”less than 30K is recommended.
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