You might want to read this thread on image processing.
Today I find a way how to easily implement image upload service together with Markdown editor. The solution is universal and can be used with any text editor.
Here is a link to short tutorial I made about how to implement file uploading. (File uploading is made by using external service)
http://blog.inventic.eu/2012/11/q2a-markdown-editor-with-file-upload/
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