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# To resize an image to a fixed width and proportional height:
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convert original-image.jpg -resize 100x converted-image.jpg
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# To resize an image to a fixed height and proportional width:
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convert original-image.jpg -resize x100 converted-image.jpg
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# To resize an image to a fixed width and height:
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convert original-image.jpg -resize 100x100 converted-image.jpg
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# To resize an image and simultaneously change its file type:
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convert original-image.jpg -resize 100x converted-image.png
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# To resize all of the images within a directory:
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# To implement a for loop:
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for file in `ls original/image/path/`;
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do new_path=${file%.*};
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new_file=`basename $new_path`;
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convert $file -resize 150 conerted/image/path/$new_file.png;
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done
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# Make text annotatation (text = Flower)
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convert flower.jpg -font courier -fill white -pointsize 20 -annotate +50+50 'Flower' flower_annotate1.jpg
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# Crop an image
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convert flower.jpg -crop 128×128+50+50 flower_crop.jpg
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# Rotate an image
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convert flower.jpg -rotate 45 flower_rotate45.jpg
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# Add a border
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convert -border 1x1 -bordercolor "#FFFFFF" image.png new-image.png
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# Convert PNG to JPEG (with 70% quality)
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convert -quality 70 image.png new_image.jpg
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