I like to give images a width in %, then it can fill as much of the screen as you wish,independent of screen resolution. E.g. in a css-file:
Code:
img.photo { width:95%;}
If I have narrow pictures, I assume a 3x4 screen, and calculate the width accordingly,e.g. if I have an image which is 500px x 1000px, the css is
Code:
img#tall-photo {width:65%;}