Imagemagick resize

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http://unix.stackexchange.com – I am familiar with convert-resize % for decreasing a size by percentage but what is the command to increase an image from say 700 pixels to 800 pixels??? Horizontal width should resize, too. I need to preserve the overall quality and look of the image as best as possible. EDIT: Mogrify -resize geometry that appears to be what I need to resize the images. Link to article for the next person trying to figure out how to resize. (HowTos)