# Resize an image to a fixed width and proportional height:
convert original-image.jpg -resize 100x converted-image.jpg

# Resize an image to a fixed height and proportional width:
convert original-image.jpg -resize x100 converted-image.jpg

# Resize an image to a fixed width and height:
convert original-image.jpg -resize 100x100 converted-image.jpg

# Resize an image and simultaneously change its file type:
convert original-image.jpg -resize 100x converted-image.png

# Resize all of the images within a directory, using a for loop:
for file in original/image/path/*; do
    convert "$file" -resize 150 converted/image/path/"$file"
done

# Make text annotation (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 128×128+50+50 flower_crop.jpg

# 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

# Apply vignette and grayscale effects to all JPGs in the CWD, using a for loop.
for FILE in *.jpg; { convert -background black -colorspace gray -vignette 200x100 "$FILE" "$FILE"; }