Imagemagick Crop command not giving perfect result

I am using Imagemagick for resizing and cropping image.

Test Image :

enter image description here

I need to re-size it for 300 x 320 frame for this first I am resizing the image and then cropping it and i am using the following commands:

exec("convert /uploadImagePath -thumbnail  300  /newImagePath");

exec("convert /newImagePath -gravity Center -crop 290x310+0+0 /newImagePath");

But it gives me following image

enter image description here

As you can see image is not complete. Where am I mistaken?