How to use stdin with caption in ImageMagick

Question

My understanding from reading the ImageMagick documentation regarding text, is that the @- notation reads the contents of standard input.

As such, this

Answer 1

No need to build from source. Just replace @- with "`tee`" :

printf "Hello\nWorld" | 
convert \
  -size 1280x100 \
  -background '#0000FF10' \
  -density 90 \
  -gravity Center \
  -fill black \
  -font Helvetica \
  caption:"`tee`" \
  test.png

`tee` will execute first and 'process' stdin before completing the convert command.