Thanks alchymyth! That Conditional_Tags page you recommended is excellent.
Here’s my preferred option:
<?php if ( !is_single() ) : // Only displays content for single posts. Displays excerpts for everything else. ?>
Alternative ways that don’t involve messing about with the master theme:
Place inline CSS in your image tags:
<img src="..." style="min-width:495px;" />
If you want scrolling overflows, place your image inside a <div>:
<div style="width:100%;overflow-x:scroll;"><img ...></div>
If you want your image to scale vertically and maintain aspect ratio, consider using “%” measurements for height.