libmagick++-6.q16-dev 8:6.9.10.23+dfsg-2.1ubuntu9 (amd64 binary) in ubuntu focal

 The Magick++ library is a set of C++ wrapper classes that provides access
 to the ImageMagick package functionality from within a C++ application.
 .
 This package includes header files and static libraries needed to compile
 programs using Magick++.
 .
 This version of libmagick++-dev is compiled for a channel
 depth of 16 bits (Q16).