Get the image or documents from Salesforce Document Object

1. Upload one image or file in Document object

2. Go to Document Object

3. Select your folder which you add your file

4. Click the viwe button near to your file name

5. Select the URL displed

6. Use this link for display the image

ex:

<img src="https://force.com/servlet/servlet.FileDownload?file=12331441431212"/>