36.25 Resize an Image
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To re-scale (resize or reduce the size of) a photo (or any image) that might be too large for sending by email, for example, or too large to include in a presentation, we can simply specify a percentage, thus retaining the aspect ratio of the image:
convert -resize 25% img.jpg imgs.jpgWe can resize an image down to a size that will fit within the
specified bounds, like 800x600. Depending on the aspect ratio of the
original image, the resulting image will be exactly 800x600, or its
width will be 800 or its height 600.
convert -resize 800x600 img.jpg imgs.jpgIf a single size is specified then either the width or the height is reduced to that size, which we can do in-place with:
mogrify -resize 800 img.jpgTo force a resize without retaining the aspect ratio:
convert -resize 800x600\! img.jpg imgs.jpgYour donation will support ongoing availability and give you access to the PDF version of this book. Desktop Survival Guides include Data Science, GNU/Linux, and MLHub. Books available on Amazon include Data Mining with Rattle and Essentials of Data Science. Popular open source software includes rattle, wajig, and mlhub. Hosted by Togaware, a pioneer of free and open source software since 1984. Copyright © 1995-2022 Graham.Williams@togaware.com Creative Commons Attribution-ShareAlike 4.0
