我无法将 .tiff 文件转换为其他格式。
这是一些调试输出：
$ convert -list configure
Path: /usr/local/Cellar/imagemagick/6.7.7-6/lib/ImageMagick/config/configure.xml
Name Value
-------------------------------------------------------------------------------
CC cc
CFLAGS -D_THREAD_SAFE -D_THREAD_SAFE -pthread -g -O2 -Wall -D_THREAD_SAFE -pthread
CODER_PATH /usr/local/Cellar/imagemagick/6.7.7-6/lib/ImageMagick/modules-Q16/coders
CONFIGURE ./configure '--disable-osx-universal-binary' '--without-perl' '--prefix=/usr/local/Cellar/imagemagick/6.7.7-6' '--disable-dependency-tracking' '--enable-shared' '--disable-static' '--without-pango' '--with-included-ltdl' '--with-modules' '--disable-openmp' '--without-gslib' '--with-gs-font-dir=/usr/local/share/ghostscript/fonts' '--without-x' 'CC=cc' 'CXX=c++'
CONFIGURE_PATH /usr/local/Cellar/imagemagick/6.7.7-6/etc/ImageMagick/
COPYRIGHT Copyright (C) 1999-2012 ImageMagick Studio LLC
CPPFLAGS -I/usr/local/Cellar/imagemagick/6.7.7-6/include/ImageMagick
CXX c++
CXXFLAGS -g -O2 -D_THREAD_SAFE -pthread
DEFS -DHAVE_CONFIG_H
DELEGATES bzlib freetype jpeg jng png xml zlib
DISTCHECK_CONFIG_FLAGS 'CC=cc' 'CXX=c++' --disable-deprecated --with-quantum-depth=16 --with-umem=no --with-autotrace=no --with-gslib=no --with-fontpath= --with-gs-font-dir=/usr/local/share/ghostscript/fonts --with-pango=no --with-wmf=no --with-perl=no
DOCUMENTATION_PATH /usr/local/Cellar/imagemagick/6.7.7-6/share/doc/ImageMagick
EXEC-PREFIX /usr/local/Cellar/imagemagick/6.7.7-6
EXECUTABLE_PATH /usr/local/Cellar/imagemagick/6.7.7-6/bin
FEATURES OpenCL
FILTER_PATH /usr/local/Cellar/imagemagick/6.7.7-6/lib/ImageMagick/modules-Q16/filters
HOST x86_64-apple-darwin12.1.0
INCLUDE_PATH /usr/local/Cellar/imagemagick/6.7.7-6/include/ImageMagick
LDFLAGS -L/usr/local/Cellar/imagemagick/6.7.7-6/lib -L/usr/local/Cellar/freetype/2.4.10/lib
LIB_VERSION 0x677
LIB_VERSION_NUMBER 6,7,7,6
LIBRARY_PATH /usr/local/Cellar/imagemagick/6.7.7-6/lib/ImageMagick
LIBS -lMagickCore -lfreetype -ljpeg -lbz2 -lz -lm -Wl,-framework,OpenCL -lm -lpthread
NAME ImageMagick
PCFLAGS
PREFIX /usr/local/Cellar/imagemagick/6.7.7-6
QuantumDepth 16
RELEASE_DATE 2012-09-18
SHARE_PATH /usr/local/Cellar/imagemagick/6.7.7-6/share/ImageMagick
SVN_REVISION 8165
TARGET_CPU x86_64
TARGET_OS darwin12.1.0
TARGET_VENDOR apple
VERSION 6.7.7
WEBSITE http://www.imagemagick.org
Path: [built-in]
Name Value
-------------------------------------------------------------------------------
NAME ImageMagick
我曾尝试卸载/安装 libtiff、imagemagick，但无法正常工作
$ brew uninstall libtiff
$ brew install imagemagick
$ brew uninstall imagemagick
$ brew install imagemagick
知道我的安装有什么问题吗？提前致谢，