Fotis wrote: It's fairly simple actually, but it does require that your create K2 template overrides so you don't lose your changes when you upgrade K2. More info on K2 overrides here: getk2.org/documentation/tutorials/174-templating-with-k2-and-the-concepts-of-sub-templates

Now, if you wanted to show a default image in the item view (in item.php) you could add this at the very top of the file:

<?php

// place the following after the "defined('_JEXEC') or die;" line
if (empty($this->item->image)) {
    $this->item->image = '/path/to/placeholder.jpg';
}

The above code will set a placeholder image when no K2 item image exists. You can follow the same pattern to set a placeholder for category views, modules etc.

Fotis wrote: An actual URL would also help...

Fotis wrote: First off, the image you reference is wrong - "www.flyingdads.gr/demo/images/Featured_articles/logo_panaxaikis_gia_site.png" throws a 404 error.

Secondly, you need to make sure the format is correct - see how it's entered: jmp.sh/21xSJNU

Fotis wrote: You should be able to grab the category ID or name using $this->item->category->id or $this->item->category->name respectively, so get that, check the ID or name (whichever you want to use as differentiator) and then make an if/else statement to load a different default image.