The reason why I mention the Garamond font issue, is that failing to find it causes test.wmf to fail.
It seems that the libwmf project has removed some files. That does not hide a problem. Due to the process of continual improvement, it seems that some Widows fonts have gone missing in my Ubuntu Linux 24.04 LTS system. The Garamond family of fonts, and some others are not where they used to be.
The redeclipse.ico file is no longer available via the provided link, but it is likely the same as this one.
WMF files - extremely long loading
Magick::Image::attribute(string, string) bug
As mentioned by Juraj Komacka, the Magick++ API was previously fixed to allow passing a NULL pointer to remove any existing attribute data under the same name. Furthermore, as of September 7, 2023 this change was made: changeset: 17203:bc0e3fe2eb00 user: Bob Friesenhahn bfriesen@GraphicsMagick.org date: Thu Sep 07 18:27:44 2023 -0500 files: ChangeLog VisualMagick/installer/inc/version.isx magick/attribute.c magick/version.h www/Changelog.html description: SetImageAttribute(): Remove SetImageAttribute()...
GIF thumbnail generation bug
I see that the images were stored on some other website and are no longer available. Re-doing the tests here based on the built-in logo image and latest (2026) ImageMagick code: gm convert logo: -resize '604x451!' /tmp/logo.jpg gm identify /tmp/logo.jpg /tmp/logo.jpg JPEG 604x451+0+0 DirectClass 8-bit 30.7Ki 0.000u 0m:0.000001s magick identify /tmp/logo.jpg /tmp/logo.jpg JPEG 604x451 604x451+0+0 8-bit sRGB 31483B 0.000u 0:00.000 gm convert /tmp/logo.jpg -quality 50 -resize x48 -gravity center -crop...