Changing image size in subcategories.

[joint77]

Hello everyone, I'm editing a template and would like to appear with images only 2columns in subcategories.

For the two columns are in place, I changed the values ​​in category.css.

For the size of the images I've seen that in BO -> Preferences - Images you can edit images but not those of the subcategories, only those categories.

How do I get the automatic creation of thumb for subcategories bigger? Without going tochange category.tpl (where I find this string <img src="{$link-> getCatImageLink ($subcategory.link_rewrite, $ subcategory.id_image, 'medium')} "alt =" "width =" {$mediumSize . width} "height =" {$ mediumSize.height} "/>) and then having to recharge them via ftp?

Thank you, Alex

Attach Image.