Image resize with fixed width and fixed height.

[eluser]Unknown[/eluser]
I am uploading an image and creating thumbnail for different size. The category are 32px/32px, 64px/64px, 150px/150px. It doing all great except one. It calculates the hieght automatically base on "maintain_ratio" = true property. But i don't want that. it should be fixed with my defined dimension. But i can't found such option for that. So do you any idea how i can do this??

thanks