libmagickcore-6-headers 8:6.9.10.23+dfsg-2.1ubuntu7 (amd64 binary) in ubuntu focal

 The MagickCore API is a low-level interface between the C programming language
 and the ImageMagick image processing libraries and is recommended for
 wizard-level programmers only. Unlike the MagickWand C API which uses only a
 few opaque types and accessors, with MagickCore you almost exclusively access
 the structure members directly.
 .
 This package includes the architecture independent header files
 needed to compile programs using MagickCore.
 .
 This package is independent of channel depth.