Image Resize Confusion Help!

[Tony]

Before I decided to  post this thread. I had searched over and over again about this problem. It makes me confused why it cannot do it? Why Jan set this up? Is there anyone or Jan can help me to clear this out?

The question is:

In the Control Panel under Settings there are several options such as Max. image width in pixel, Max. image height in pixel, and Max. image size in KB. What is the purpose of these option? To resize the pics or just to show users know that they should upload their pics that fit the designated size. These options didn't work actually, why does Jan set them up?

Does anyone know? Please help me to clarify this. Thanks.