Does image URL affect SEO

This article says a lot of SEO advantages (regarding content and keywords, not speed) are lost when using a CDN for images:

– https://www.gobluemedia.com/blog/content-delivery-networks-cdn-seo/

And an interesting read here, paragraph 12, second part:

– https://ahrefs.com/blog/image-seo/

It says:

“Still, it’s worth noting that your CDN will have a URL like xyz.cdnprovider.com.

That isn’t great for SEO for the following reasons:

Your images are effectively hosted on a separate domain. If someone chooses to embed one of your images and link to you, there’s a chance they will link to the CDN instead. That means you miss out on a link.

It can cause problems if you wish to change CDN provider in the future. You will have to change (or redirect) all of your image URLs, etc.

Here’s John Mueller’s advice when it comes to CDNs:

CDN URLs is fine, but I’d try to avoid moving image URLs too much, so I’d tend towards using your own domain/subdomain (via CDN).

— ?? John ?? (@JohnMu) October 17, 2017

For that reason, I would recommend setting up a CNAME record. Think of this as an alias that can be used instead of the ugly URL that gets assigned to you by the CDN provider. So instead of xyz.cdnprovider.com, your CDN can be cdn.yourdomain.com.”

Hmm, I see I need a $39/month package for that, right?

– https://optimole.com/pricing/

Hmm…

Hello,

You can use a custom domain to serve images from a domain you own. We offer this feature on all our Business packages.
Regarding the SEO aspect, we do provide canonical header links to original sources of the images that are being lazy-loaded.

Let us know if you have more questions.
Thank you!

Thnx!

Can you please explain how to use ‘canonical header links to original sources of the images that are being lazy loaded’?

Hello,

We automatically set that Header that points to the original image on all our placeholder images used during lazy-load.
So there is nothing that should be required from you.

Let us know if you have more questions.
Thank you!

Thank you.

Does that mean that search engines, like Google, read those canonical header links? Instead of the final links to optimoles CDN?

Hello,

Yes they usually interpret those Optimole links as references to the original source.

Alright, good to know.

So final question then, where it all started ??
Can you confirm that use of Optimole does not negatively impact keyword/URL SEO, even if I turn off Optimole later of switch to another optimizer and/or CDN?

It should not impact your SEO.
We try our best to improve your website speed without disrupting other services or functionality.

Thank you! ??