Paste image from clipboard, save the image to a file and insert the relative path on the current cursor.
use package control
Take a screenshot, then just ctrl+v to paste it. It will save a png file to current directory and insert the file path in the current cursor.
- When copy to markdown buffer, it will display the image path for markdown, eg: 
- When copy to other buffer, it will display only the image path pic_path at the cursor.
3. Preview within Sublime Text.
