Take the 2-minute tour ×
Webmasters Stack Exchange is a question and answer site for pro webmasters. It's 100% free, no registration required.

I recently started with blogger. I was tweaking the homepage a bit to display thumbnail and post excerpts with read more link.

A lot of websites say to use this kind of code:

  <b:if cond='data:blog.pageType != &quot;index&quot;'>
      <b:if cond='data:post.snippet'>
      <b:if cond='data:post.thumbnailUrl'>
          <div class='Image thumb'>
            <img expr:src='data:post.thumbnailUrl'/>
          </div>
      </b:if>
        <data:post.snippet/>
      <b:else/>
        <data:post.body/>
      </b:if>
  <b:else/>
  <data:post.body/>
  </b:if>

But can we tell blogger what's in data:post.thumbnailUrl? For some people, blogger will just pick an image magically from their post.

How can I decide which thumbnail will be used?

share|improve this question
add comment

2 Answers

up vote 1 down vote accepted

You can't control this, Blogger decides for itself which image to use.

I did some reasearch a while back (documented here), and concluded that it's most probably the first pictures in the post which is both

  1. over a certain size, and
  2. hosted in your own Picasa-web-albums / Google + Photos albums.

From memory, I think that testing showed that the size was 17k. But I'm not 100% sure if that rule is universal - it may depend on the picture dimensions, too, since I cannot see that a very tall or wide thumbnail would be overly useful.

share|improve this answer
    
You are right, I did more digging after that and I could not understand why my first and unique image in my post was not taken as thumbnail. It turns out that it was because I inserted this image with a link to my Amazon S3. I don't understand why there is no official doc about this. Thanks for your answer. –  Amida Mar 8 '13 at 11:52
add comment

Blogger doesn't pick images by magic. Blogger will automatically choose the first image as a thumbnail. So if you need to keep your own image as thumbnail, please make sure that the desired image is kept first while you write the post.

share|improve this answer
    
Yes but the problem, as I mentioned in a previous comment, is that it did not work because the image was not hosted in Picasa / Google img related services. Something that is (was?) totally not indicated anywhere. –  Amida Oct 1 '13 at 14:40
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.