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Originally Posted by Sailor Steve
I was told by someone else that since the pictures are hosted elsewhere they don't affect Neal's bandwidth and costs, but I'm not sure about that.
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Yes, I told you that and I know what I'm talking about. Here's further reference:
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Note: When a web page is loaded, it is the browser, at that moment, that actually gets the image from a web server and inserts it into the page
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Source:
http://www.w3schools.com/html/html_images.asp
Image inline linking can also be used for Hotlinking, or bandwidth theft.
Quote:
<img src="http://notmysite.com/image.jpg" height="350" width="200">
This tag tells the site to request the image.jpg from a different server other than your own. Every time the page is loaded, the outside server has to use its bandwidth to display the image. To avoid this problem, don't link to files on servers that don't belong to you. To share images and files on your own web page, upload them to your own server's directory or to a free image hosting service that allows direct linking.
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Source:
http://altlab.com/hotlinking.html
PNG is a lossless format while JPEG uses lossy compression. That is a JPG file may contain visual artifacts based on the level of compression. The greater the compression, the smaller the file but with data loss. However you can have 10:1 compression with little perceptible data loss.
Conclusion
Given the scope of uploading game screenshots to a forum and not for high quality printing JPG should be more than enough for you and it helps more people to see your image.