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Editorial Team
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Asked: 2026-05-12T05:46:31+00:00

I have the following commands that create a sprite containing a normal state and

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I have the following commands that create a sprite containing a normal state and a hover state:

convert -background none -pointsize 11 -fill white -size 100x -gravity NorthWest caption:'Test' top.png
convert -background none -pointsize 11 -fill grey -size 100x -gravity SouthWest caption:'Test' bottom.png
montage top.png bottom.png -geometry +0+0 -tile 1x2 -background none test.png

I’m creating two images, top.png and bottom.png then combining them to create test.png.

Is there a way to do this without having to write the top and bottom images to disc?

Can I pipe the commands together some how?

Update: Solution

montage \
  <(convert -background none -pointsize 11 -fill white -size 100x -gravity NorthWest caption:'Test' png:-) \
  <(convert -background none -pointsize 11 -fill grey -size 100x -gravity SouthWest caption:'Test' png:-) \
  -geometry +0+0 -tile 1x2 -background none test.png
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1 Answer

  1. Editorial Team

    This is completely untested, so make sure to backup the relevant images before testing:

    montage \
  <(convert -background none -pointsize 11 -fill white -size 100x -gravity NorthWest caption:'Test' png:-) \
  <(convert -background none -pointsize 11 -fill grey -size 100x -gravity SouthWest caption:'Test' png:-) \
  -geometry +0+0 -tile 1x2 -background none test.png

    (This is called “Process Substitution“)

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