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1 |
Scale maintaining aspect ratio, the image to fit in the resize box:
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2 |
convert a.png -resize 50x50% b.png
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3 |
(add a ! after % if you're not interest in aspect ratio.
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(add -filter lanczos before -resize, if you want a lanczos resizer)
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Crop:
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-crop widthxheight{+-}x{+-}y{%}
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