- Should be no more than 4 lines high (including any blank lines)
- Should not contain any images/banners
- Should not contain bold, or large type
- Should only contain black type
- Images should be limited to Emoticons/smilies only
- Should be no wider than 120 pixels
The main thing with avatars is they shouldn't expand the width of the author column beyond its set width. Otherwise they can become a bit dominating and take up space which could be better used by the content of the post. By limiting the dimensions it also keeps the filesize at a reasonable level. The Avatar Control Panel can be found at the bottom of the My Profile page.
NB See this post for resizing advice.
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