cheat.sheets/sheets/convert

# convert
# Image converter and manipulator

# 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, which in this example is '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 around an image.
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 & 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"; }

# Convert and combine multiple images to a single PDF.
convert image1.png image2.jpg image3.bmp output.pdf