Sitemap to index Full size images and not Thumbnails

[MEGA]

@TechnoBear

If it can’t access your images, it can’t index them, so that would be the first thing to check. Have you excluded your images folder in your robots.txt, for example?

No I have not excluded any folders in .htaccess
Will search for a way to see if google can actually see “Crawl” the large images.

I have checked Highslide viewer and it sounds good. Simple, practical and light weight. Will try it on a local environment first. Thanks for the suggestion.

[MEGA]

SOLUTION

The problem was solved when I used Structured Data from http://schema.org
Specifically ImageObject.

Before:

<div class="thumb">
  <a href="images/wallpaper.jpg">
     <img src="images/wallpaper-small.jpg" alt="wallpaper-description">
  </a>
</div>

After:

<div class="thumb" itemscope itemtype="http://schema.org/ImageObject">
  <a href="images/wallpaper.jpg" itemprop="contentUrl">
     <img src="images/wallpaper-small.jpg" alt="wallpaper-description" itemprop="thumbnail">
  </a>
</div>

Large images started indexing within one day and the alt attribute for the thumbnails is now set for large images.
Also I have blocked the thumbnail images in robots.txt so that they don’t appear in Google Search Result.

Thank you everyone for your contribution

[arshiahmed080]

Hi. Can you please tell me how exactly you did it? My posts have around 30 to 40 images and they link to the attachment pages. I want the medium and thumbnail sized image on the main post, but google isn’t indexing the original sized images. And I’ve marked the attachment pages as noindex. Please help