I run into this problem quite frequently: I'm given an image to use in a web page but the image dimensions do not match the dimensions of the area where I need to place it.
If I resize the image in PS constraining proportions so the image does not distort (e.g. stretch or flatten), I can only ever reset one dimension (height or width) to the correct size while the remaining dimension will always reset either larger or smaller than what I need.
Short of going back to the person who gave me this image and asking for them to redo it with the necessary dimensions, is there a way I can do this myself using Photoshop or Fireworks?
Also, is there a particular name for what I'm trying to achieve? By that I mean I don't think this is simply resizing an image since I am really trying to fundamentally alter the original proportions of it in a different sense ... at least that's how it seems to me.