Blog Featured Image Size

Hi, what is the current – November 2019 – default featured image size?

Dear All,
I’ve reviewed this thread, but still don’t understand: In the code that Yigit provides it specifies the thumb size. I don’t want to modify the thumb size; only the featured image on the blog post.
What is final code to add to the functions.php file to make the Featured Image appear as a proportionate full size on a blog post?
Please advise.
Thank you,
Tim

PS It looks like there is a span with a class name ‘image-overlay’ that is masking the image. ? Could the fix be to remove this?

Dear All,
The more I look for solutions, the more I find it hard to believe that there isn’t a simple option in the ‘blog layout’ section to ‘show featured image as a responsive full size’. ?
Also, here https://kriesi.at/support/topic/full-size-featured-image-in-single-blog-page/ it says:
“You can actually modify the includes > loop-single.php file in your child theme to override the default thumbnail settings. Just look for this code around line 66:

 */
    $size = strpos($blog_style, 'big') ? (strpos($current_post['post_layout'], 'sidebar') !== false) ? 'entry_with_sidebar' : 'entry_without_sidebar' : 'square';

Set the default thumbnail sizes from “entry_with_sidebar” and “entry_without_sidebar” to “full” or “extra_large”.”

BUT, in my includes directory, there isn’t any file named loop-single.php. ?

but allways think of : after changing these sizes – a regeneration of the calculated thumbnails had to be done ( see this again: Then regenerate thumbnails … )
You can read here about the influence of some parameters to those changed or new sizes: https://developer.wordpress.org/reference/functions/add_image_size/ – especially the crop ( true, false ) ;) seems to be important.

@ismael and all:

I remembered I had some custom CSS to keep the featured image from being too big. Here it is:

/* This sets the featured image to be a fixed size; that way it isn't shown bigger than it actually is */
.big-preview img {
width: inherit !important;
max-width:500px !important;
/*max-height:500px !important;*/
margin:auto !important;
}

For some reason the max-height together with the max-width was causing the deformation. So, I commented the height and it seems to work fine.

All in all, this issue strikes me as way too complicated than it should be, i.e., having to change code in a file + custom CSS. Would be good in a future release to simply have more direct options for the Featured Image.

Best,

Tim