I have been trying to size my screenshot.png for my theme to 300x255 without losing aspect ratio. I have been doing this by getting my browser window width on my laptop to a size that is proportional to 300x255 so that I will get a screenshot without distortion but has not worked.
Moreover, I am working with a fixed width layout, that has a central content area and a background. Reducing the browser window will cover the background which is not desirable.
I believe there must be an easier way to do this and would like to know if there are any tools that theme developers use to get this right. I do not have photoshop but do have gimp installed.
I would appreciate any pointers you may have in this regard.
Thanks in advance nav