Overriding default ImageMagick thumb driver

[piper]

I’m trying to figure out a way to override the default ImageMagick thumb driver in Kirby 3, similar to what is discussed on this Kirby 2 thread:

Image format conversion in thumb()

Is it possible to convert the image format of uploaded images? My client has uploaded a lot of .png files, and it would be more bandwidth-friendly to serve them as .jpg instead. I already use the thumb() method to display most images on the site to control resolution and file size. I imagine something like this: thumb($img, array('convert' => 'jpg', 'quality' => 70)) Any suggestions?

But I cannot seem to find any guidance on it anywhere! Perhaps I’m searching for the wrong thing? If anyone has any tips or examples, I would be super grateful!!

(Specifically I’m trying to dither specific images, not all, but I can dig in to that after I figure out how to override the driver in the first place!)

[ahmetbora]

You can override thumb core component, here documentation:

Thumbs

[piper]

Ahhh thank you so much. That looks like exactly what I was looking for!

[texnixe]

If you want to override the IM and GD drivers, check out the Focus plugin for an example: https://github.com/flokosiol/kirby-focus

You probably don’t want to create your own thumb generator?

[piper]

I suppose not? I’m not sure. The goal is to be able to dither certain images, basically. I figured this is going to involve modifying the existing IM driver in some way, but that might not be right!

[texnixe]

@piper

I figured this is going to involve modifying the existing IM driver in some way, but that might not be right!

Yes, I think that’s right.