NB: See bottom for actual question

There is an awesome screenshot utility for Windows called Shotty. It preserves translucency and drop shadow effects in screenshots. For example:

enter image description here

However, a screenshot from Ubuntu's built in utility does not preserve these effects, and looks pretty bad in comparison:

enter image description here

So, is there a screenshot utility for Ubuntu that will preserve the "eye-candy" like Shotty does?

  • 2
    Have you tried "shutter"? – Ravexina May 17 '17 at 19:33
  • @DavidFoerster Perhaps you should post that as an answer then – Android Dev May 27 '17 at 11:39

I don't think that's possible with the way display servers and window compositors interact in Linux (as opposed to Windows where the two are coupled much more tightly). However you can post-process the image to add a drop shadow similar to that added by the window compositor.

Find a suitable drop shadow filter

I found and played around a bit with ImageMagick’s -shadow filter and came close with these parameters:

convert :input.png \( +clone -background black -shadow 50x5+2+2 \) +swap -background none -layers merge +repage :output.png

As a bonus the shadow uses transparency for image formats like PNG (at 32 bit colour depth) that support it. Result from the example in your question:

screenshot with drop shadow

You can find a more in-depth explanation on the shadow filter in the Examples of ImageMagick Usage.

Combine the filter with a screenshot tool

We can write a small script to combine the above filter with a screenshot tool like gnome-screenshot:

printf -v filename '%s/screenshot %(%F %T)T.png' "$HOME" -1
tmpfile="$(exec mktemp --tmpdir --suffix=.png screenshot.XXXXXXXXXX)"
trap 'rm -f -- "$tmpfile"' EXIT
gnome-screenshot "$@" -f "$tmpfile"
convert ":$tmpfile" \( +clone -background black -shadow 50x5+2+2 \) +swap -background none -layers merge +repage ":$filename"

…or use what’s already there

It appears the GNOME developers had a similar idea and integrated a shadow filter into their screenshot tool:

gnome-screenshot --window --border-effect=shadow

This creates almost the same visual effect as above:

You can unbind the default keyboard shortcut for screenshots and create an identical shortcut for a custom command like the one above.

For more info see gnome-screenshot(1).

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