How do you post larger images?

[Steve]

How does one load larger images? All I seem to be able to do is add attachments (that cannot be bigger than 500k) which forum members can view by clicking on. If I want to post, say a larger newspaper article that anybody can read without being a forum, I have to email a copy of the image to Roger and he posts the image.

But I've seen people post images/photographs that are larger and readable. How is that done?

For example, in the thread linked below why is my image of Fido smaller than Darrell's images of Fido:

http://rogerjnorton.com/LincolnDiscussio...age-7.html