[TYPO3] images not enlarged

[typo3 at net-products.nl]

When I put images to page content the image is shown in the frontend.

Problem 1:
But when I select "click enlarge" option, the image is shown. But in the
SAME size.

Problem 2:
When I place a value in pixel witdh or heigth,nothing changes.

I am running under Linux and installed ImageMagick, gd and  php-gd

Do I miss something??

thanx for helping

Nico