Currently I have a lot of images sized manually at 400x250. I want to use imsanity to resize all images upon upload to 400x250. However for some reason images are rendered either at 400x240 or something like 300x125, never 400x250.
I'm assuming that wordpress forces images to keep their aspect ratio. However in my case I don't want that, I want the images forced to the size 400x250 regardless of aspect ratio. Where should I modify to allow this to happen?