Thank you, kardotim, for the links, especially the one on Image Editing in the Library.
However, image editing within a post remains awkward. For example, you can't increase the size of an image over 100% unless you manually change the Width and the Height. And when you change one, the other does not change in proportion -- that's annoying and we should have the option of proportional re-sizing.
And how do you change the position of an image once it's in the post without deleting it and trying to place it somewhere else? We should be able to grab it and move it.
Interestingly, there are 'handles' around the image box when I edit in Firefox and Internet Explorer and I can grab a corner and re-size the image at will. Not so in Google Chrome. But I guess that's a quirk of the programs, eh?