You've probably been editing the picture in MS Paint, which saves images in BMP format. This is a very large format. You need a compressed format like JPEG or PNG.
Use Irfanview to convert to JPEG(if it's a picture from a camera) or PNG(if it's anything else, such as a drawing). Download: [Link](Mouse over link to see full location)
You convert by opening the image in Irfanview and then going to File -> Save as... Then choose the type in the bottom dropdown.
TheAnnie answered Saturday May 3 2008, 11:25 am: What I did when the picture I wanted didn't work, I went on Photoshop or Adobe and changed it up. Then I saved it as a jpg. It worked. So maybe you could give that a shot. [ TheAnnie's advice column | Ask TheAnnie A Question ]
LM answered Saturday May 3 2008, 1:39 am: It's a lot easier to upload your picture on www.tinypic.com, and then put a link to it as "URL of a picture of you"
That way your picture can be almost any size you want and you don't have to worry about file sizes or anything. :] [ LM's advice column | Ask LM A Question ]
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