No, the wp_get_attachment_image_src function calls image_downsize, which in turn calls image_get_intermediate_size itself. It doesn’t cause generation of the images, it is simply getting the relevant images from the meta and choosing the correct one to use.
i think the best way to alter images is through css. you add a class to all your pictures that would set its size into your custom size. I think bootstrap has that feature
I don’t know of a plugin! Wordpress stores uploaded images in a media library which puts them in the posts table. As you have copied and pasted they are not in the media library, but just as img tags in the posts/pages themselves. Step 1 – copy the image files themselves, using an FTP to … Read more
You require Advanced Custom Fields. Install the plugin in your site. Advanced Custom Fields Read the above documentation. Create a image upload field and use the field in both front-page.php and content-page.php
How can I hook and edit on the fly an image uploaded
For this feature to work the images must be uploaded to the media library from that page. In other words, clicking the “Add Media” button and adding images already in your media library won’t do it. You must click “Add Media” then “Upload Images” and add them to the page.
Custom WordPress Theme – No Slider(s) Images
I think it is possible with custom fields. Add a custom fields, for example, named link. Put the link into the value field. Then you will be able to access it something like that: <a href=”https://wordpress.stackexchange.com/questions/187970/<?php echo get_post_meta( get_the_ID(),”link’, true ); ?>”> <?php the_post_thumbnail(); ?> </a>
There is no default way to do this, but this popular plugin solves the issue for most people. I have no connection to the creators of this free plugin, but I’ve used it on several sites. https://wordpress.org/plugins/enable-media-replace/
If you are talking about a featured image on each post, the wordpress hook is the_post_thumbnail(); You may be able to find that on the template you are working with and remove it? Images embedded in posts or pages would be different. https://codex.wordpress.org/Function_Reference/the_post_thumbnail