Change Resolution

Change Image Resolution

You can use ImageMagick's convert function to change the resolution of an image:

convert original.png -resize 100x100 new.png

To resize an image to specific dimensions, without maintaining the original image’s aspect ratio, include a bang ! at the end of the dimensions:

convert original.png -resize 100x100! new.png

You can also use percentages with the resize flag. For example, if you want to make an image smaller by 50%, all you need to type is:

magick original.png -resize 50% new.png

If you want to change the resolution of a video to 480x320, you can do this simply by entering the command:

ffmpeg -i input.mp4 -vf "scale=480:320" output_320.mp4

Alternatively, if you know the width you want and you want to keep the same aspect ratio, you can use -1:

ffmpeg -i input.mp4 -vf "scale=480:-1" output_320.mp4

If you want to change the aspect ratio, you can use the setdar flag:

ffmpeg -i input.mp4 -vf "scale=480:320,setdar=4:3" output_320.mp4