ImageMagick无法生成.CR3照片缩略图，Libraw已安装仍异常

我使用ImageMagick处理CR3格式RAW照片时失败，提示需要安装Libraw。在GitHub提交Bug后得到反馈称Libraw未安装，但我已经尝试安装相关包，问题仍未解决。

已执行的安装操作及输出 #

• 执行命令：sudo apt -y install libraw-bin
  输出：

  Reading package lists... Done
  Building dependency tree... Done
  Reading state information... Done
  libraw-bin is already the newest version (0.20.2-2ubuntu2).
  The following package was automatically installed and is no longer required:
  php8.1
  Use 'sudo apt autoremove' to remove it.
  0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded

• 执行命令：sudo apt -y install libraw20
  输出：

  Reading package lists... Done
  Building dependency tree... Done
  Reading state information... Done
  libraw20 is already the newest version (0.20.2-2ubuntu2).
  The following package was automatically installed and is no longer required:
  php8.1
  Use 'sudo apt autoremove' to remove it.
  0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

ImageMagick版本信息 #

执行convert -version输出：

Version: ImageMagick 6.9.11-60 Q16 x86_64 2021-01-25 https://imagemagick.org
Copyright: (C) 1999-2021 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC Modules OpenMP(4.5)
Delegates (built-in): bzlib djvu fftw fontconfig freetype heic jbig jng jp2 jpeg lcms lqr ltdl lzma openexr pangocairo png tiff webp wmf x xml zlib

转换命令的错误信息 #

执行命令：convert /media/storage/admin/mike/sam-grad-2023/image.CR3 -thumbnail 200x200 image.png
错误输出：

convert-im6.q16: delegate failed 'ufraw-batch' --silent --create-id=also --out-type=png --out-depth=16 --output='%u.png' '%i'' @ error/delegate.c/InvokeDelegate/1966. convert-im6.q16: unable to open image /tmp/magick-Plw9lpdRh7_nHsISzt-dXhIHJAOm9olK.ppm': No such file or directory @ error/blob.c/OpenBlob/2924.
convert-im6.q16: no images defined `image.png' @ error/convert.c/ConvertImageCommand/3229.

解决方案 #

1. 安装ufraw工具
   从错误信息能看出，ImageMagick调用ufraw-batch处理RAW文件，但该工具未安装。执行以下命令安装：

   sudo apt install ufraw
   

   安装完成后重新尝试转换命令。

2. 重新编译ImageMagick并启用libraw支持
   你的ImageMagick内置委托列表中没有libraw，说明当前版本编译时未链接libraw库。如果ufraw无法解决问题，可重新编译：

   • 卸载现有ImageMagick包：sudo apt purge imagemagick
   • 安装编译依赖：sudo apt install build-essential libraw-dev libpng-dev libjpeg-dev libtiff-dev
   • 下载ImageMagick源码，编译时添加--with-libraw参数：

     ./configure --with-libraw
     make
     sudo make install
     

   • 验证安装：执行convert -version，检查Delegates部分是否包含libraw。

3. 用dcraw手动转换CR3文件
   CR3是佳能专属RAW格式，旧版ufraw对其支持有限。可安装dcraw工具手动转换后再处理：

   sudo apt install dcraw
   

   执行转换命令：

   dcraw -c /media/storage/admin/mike/sam-grad-2023/image.CR3 | convert - -thumbnail 200x200 image.png
   

内容的提问来源于stack exchange，提问作者Depict8997