Resize image with mogrify without keeping aspect ratio
After another half hour of searching I have stumbled upon the overly simple answer. The following will resize an image with the exact dimensions given: mogrify input.png -resize 256×256! output.png If you want to read more about it, I got the answer from this link: https://superuser.com/questions/212752/how-to-stretch-an-image-in-one-dimension