Thumbnail generation position

AFAIK, you can’t at this time…with the built in function.

There may be other thumbnail options you can look into if you are interested

Hm, I don’t mind modifying some core files if that’ll do the trick..?

It might, but its a bad idea really….

I’m not sure if you could do it with a function or plugin, I’ve never looked at the stuff.

But I’m pretty sure anybody here would recommend you don’t touch core files.

Simply put, you will lose your changes on a blog upgrade. And you have to upgrade for security if nothing else.

I understand the consequences of doing such thing, I am a experienced webmaster for quite some years now.
But AFAIK there is no function for it, nor plugin. And I DO know it’s easier to program to use the top left as starting point while cropping, so somewhere in the WordPress code there’s a line that defines to use something else then the topleft corner.
I want to know where that is, so that I might write my own function for it – maybe a plugin.

https://core.trac.www.ads-software.com/browser/tags/3.0.1/wp-includes/media.php

hmmm… is it in here?

Handles all the image resizing

Yes! There it is, now to figure out how it works (ahhh, math..!) (line 341)

if ( $crop ) {
		// crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
		$aspect_ratio = $orig_w / $orig_h;
		$new_w = min($dest_w, $orig_w);
		$new_h = min($dest_h, $orig_h);

		if ( !$new_w ) {
			$new_w = intval($new_h * $aspect_ratio);
		}

		if ( !$new_h ) {
			$new_h = intval($new_w / $aspect_ratio);
		}

		$size_ratio = max($new_w / $orig_w, $new_h / $orig_h);

		$crop_w = round($new_w / $size_ratio);
		$crop_h = round($new_h / $size_ratio);

		$s_x = floor( ($orig_w - $crop_w) / 2 );
		$s_y = floor( ($orig_h - $crop_h) / 2 );

Alrighty, that wasn’t all to hard. I found this; a good explanation for what I found; https://shailan.com/how-to-change-post-thumbnail-crop-position-in-wordpress/

As it sais, this function isn’t pluggable.. but it’s a minor edit, of which there is no real problem if the edit gets reverted on an update, plus it’s easy to notice and change back after an update! ??

Good stuff!

I can’t believe it isn’t possible to achieve this without editing the core files! I really don’t like the idea of editing the core files so I may just have to stick with the centre cropping ??