Hi
I did not mean inside or related to 4SEO. Inside of 4SEO, your settings are correct and I did check that in the 2 places where 4SEO is using this images (OGP tags output for Social Networks and 404 error page), this is working as expected.
In both cases, the URL is correct and the image renders as expected with no error.
Could this have anything to do with the option: "Always redirect to lowercase URLs" in the Page settings of 4SEO?
Not really. If the file exists, then images are not rendered through Joomla. Your webserver responds directly with the image and Joomla or 4SEO do not have any impact on the image URL or content.
If the image is a 404, then yes, the URL will likely go through 4SEO as it will try to apply the redirect to lowercase thing.
Importantly, this is not the source of the 404. The sequence of event is:
1. A request is made for begrippen/insecten/images/Gekko.png
2. That URL is wrong, the file does not exist in the folder /begrippen/insecten/images
on your server disk, so your .htaccess sends the request to Joomla, in case Joomla would know what to do
3. At this stage, 4SEO likely redirects to the lowercase version, begrippen/insecten/images/gekko.png
4. This fails too of course, and you see a 404 error record with the lower case name
But again, that's not the source of the 404. The source of the 404 is that the URL is incorrect in the first place, it should be /images/Gekko.png
I don't use the image anywhere else,
It does not have to be you. It can be any crawler on the web, any browser extension running on one of your visitors...
Best regards
Yannick Gaultier
weeblr.com / @weeblr