Hi,
% SOT
\starttext
Happy face: \framed[frame=on]{\externalfigure[happy.png]}
Happy face: \framed[frame=on]{\externalfigure[happy2.png]}
\stoptext
% EOT
Run: magick happy.png -alpha extract -alpha shape -background "#00ccff"
happy2.png
Expected: Two happy faces appear.
Actual: Top happy face appears, bottom happy face shows a white background.
One workaround is to specify png:color-type 6:
magick \
happy.png \
-alpha extract \
-background "#${COLOUR_AC}" \
-alpha shape \
-define png:color-type=6 \
happy2.png
$ magick --version
Version: ImageMagick 7.1.2-7 Q16-HDRI x86_64 e3e6b54ad:20251014
https://imagemagick.org
$ context --version
mtx-context | current version: 2025.09.25 18:46
Original happy face is also at: https://i.imgur.com/NLEeIkI.png
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