March 2014:
So, I set my FRED graphs to 800 pixels wide by the default height, 450 I think. I even keep my browser set at a width that gives me the 800-pixel graph width automatically. Or anyway I did, until a recent update of the FREDGraph system.
Now I get the graph all set up as I want it, 800 pixels wide and all, and use the Firefox browser's "take a screenshot" button to perfectly capture the image -- the button "knows" where the edges of the graph are, so it is easy to capture an image that needs no cropping.
I used this method religiously. Since the update, it no longer works as expected.
This time, instead of opening the file after saving it, I right-clicked it and clicked "Properties". The "Details" tab tells me that the size of the image is 640 x 360.
