Crop thumbnails in different way for specific thumbs - how?

[hakeryk2]

Hello,

 

I am currently struggling with an issue: how to render different thumbnails for in example just small_default.jpg files.

What should I change in imageManager.php to check if the presta is processing small_default (or any other) file and add my changes to it? In which function should I look for it?

 

I just want to render all the files as they are curently processing (with white stripes etc) but I just want to edit this one specific type to be render in different way (with Imagick but this is my issue).

 

Any help will be appreciated.