Automatic height resizing thumbnails

[PrestashopTrackglobe]

Hi all:

 

I've been doing the class reviewed the function of regenerating the thumbnails but not quite understand.

 

The question for you to know is how I can tell prestashop (from administration or modification of code) that the height of the image is automatically resized and fixed measures, for example:

 

example:

 

If indicated 100x100 image that occupies generated proportional to not deform doing.

If we have uploaded a picture of us focus 400x1000, my contention would be that the trigger at 100x250 and so respectively (respecting the width).

 

 

Any thoughts on this?

 

A greeting.