imagemagic, command line watermark text into image

watermark-text.sh

# make stamp
convert -size 300x50 xc:grey30 -font Arial -pointsize 50 -gravity center \
          -draw "fill grey70  text 0,0  'SomeText'" \
          stamp_fgnd.png
convert -size 300x50 xc:black -font Arial -pointsize 50 -gravity center \
          -draw "fill white  text  1,1  'SomeText'  \
                             text  0,0  'SomeText'  \
                 fill black  text -1,-1 'SomeText'" \
          +matte stamp_mask.png
composite -compose CopyOpacity  stamp_mask.png  stamp_fgnd.png  stamp.png
mogrify -trim +repage stamp.png


# watermark
composite -gravity south -geometry +0+10 stamp.png  test.jpg \
            wmark_text_stamped.jpg