: What is the benefit of ImageObject schema org markup for images? Is there anything to indicate that marking up images as ImageObjects has any positive effect on indexing or search engine ranking
Is there anything to indicate that marking up images as ImageObjects has any positive effect on indexing or search engine ranking or anything related (eg, rich cards/snippets)?
My experience
I dynamically marked up all the images on a site with full ImageObject schema.org structured data markup in the microdata format.
The result was hundreds of entries per page, like this:
image
@type ImageObject
name Widget
url widgetcorp.com/some-image-1.jpg width
@type Intangible
name 40
height
@type Intangible
name 40
On Search Console/Google Webmaster Tools, the Structured Schema sections showed literally 100's of thousands of ImageObjects. No errors for any of them. When any individual page type on the site was tested with Google's Structured Data Test, again, all the images perfectly passed validation without errors or warnings, along with all the rest of the schema objects that were present on the page.
Yet, I couldn't detect any difference whatsoever in ranking or indexing of images or anything at all search engine related. Have you had a different experience with marking up images as ImageObjects?
EDIT 1:
Didn't mean to leave off the image filename off the URL. Just a typo - on site, I was properly passing an image file URL.
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First of all, for the image property, Schema.org expects either an URL value or an ImageObject value. This is typically the case for other properties taking an image value, too.
So for the image property, you could as well use:
<div itemscope itemtype="http://schema.org/Thing">
<img itemprop="image" src="image.png" alt="" />
</div>
So why should an ImageObject value be used instead?
If you want to provide data about the image, you have to use ImageObject, because you can’t add properties to an URL value. Such data could be the height and width of the image, or its author, or its caption, etc.
Like it’s always the case with structured data: some consumers care about this additional data, some don’t (and ignore it).
In case of Google Search
For its image-related search features, Google typically (probably even in all cases) requires an ImageObject value (instead of an URL value). See for example these questions:
The attribute image.itemtype has an invalid value
“image” property inside Article with or without ImageObject?
So if you care about Google’s search features and you can provide the required additional data, you’ll probably want to use an ImageObject instead of an URL value.
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