How to load images (Header and footer) in the VF Email template?

Question

I am looking to load the header and footer images present in the Document tab When I click on the URL: https://c.cs53.content.force.com/servlet/servlet.ImageServer?id=0150j000000DHQL&oid=00D0j000000CrDy&lastMod=1490844866000, I see the image opens up. Now the same image I want to open it in the VF Email Template, so I write the following logic but it did not get worked why ??

<messaging:emailTemplate subject="Case Description - {!relatedTo.Description}" recipientType="User" relatedToType="Case">
    <apex:image id="Logo" value="https://c.cs53.content.force.com/servlet/servlet.ImageServer?id=0150j000000DHQL&oid=00D0j000000CrDy&lastMod=1490844866000" />
    <messaging:htmlEmailBody >

    </messaging:htmlEmailBody>

</messaging:emailTemplate>

What is the best way to load images (as a header and footer) in VF Email Template ?

UPDATE-1::

I have loaded the image but its getting break. Why ? Please guide.

I used both image as jpg and its broken .Please guide

The code I used

<messaging:emailTemplate subject="Case Description - {!relatedTo.Description}" recipientType="User" relatedToType="Case">

    <messaging:htmlEmailBody >
        <apex:image value="{!URLfor($Resource.HeaderFooter, 'HeaderFooter/abc.jpg')}"/>
        <apex:image value="{!URLfor($Resource.HeaderFooter, 'HeaderFooter/xyz.jpg')}"/>
    </messaging:htmlEmailBody>

</messaging:emailTemplate>

Answer 1

As mentioned in the docs

1. Add an image to the Documents tab.
2. On the Documents home page, open the image by clicking its name.
3. Right-click the image and get its reusable URL address. When you use the URL, you reference the copy of the image on the Salesforce server.
4. Open your custom HTML or Visualforce template.
5. Place the HTML tag , using the image’s URL address, where you want to insert the image in the email template.

Example

<apex:image id="Logo" value="https://yourInstance.salesforce.com/servlet/servlet.ImageServer?
id=015D0000000Dpwc&oid=00DD0000000FHaG&lastMod=127057656800" />

You can also use an external image using the absolute URL

<img src="http://www.401khelpcenter.com/syndicate/img/AF-Logo_Brown_Small.gif" alt="Logo"/>