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