# convert -sample 500x500! .png .png #把512*512的图片修改为500*500的图片

# which convert

/usr/bin/convert

# rpm -qf /usr/bin/convert

ImageMagick-6.7.8.9-.el7_2.x86_64

# yum search ImageMagick

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 * base: mirrors.tuna.tsinghua.edu.cn

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 * extras: mirrors.aliyun.com

 * updates: mirror.vodien.com

=========================== N/S matched: ImageMagick ===========================

ImageMagick-c++.i686 : ImageMagick Magick++ library (C++ bindings)

ImageMagick-c++.x86_64 : ImageMagick Magick++ library (C++ bindings)

ImageMagick-c++-devel.i686 : C++ bindings for the ImageMagick library

ImageMagick-c++-devel.x86_64 : C++ bindings for the ImageMagick library

ImageMagick-devel.i686 : Library links and header files for ImageMagick app

                       : development

ImageMagick-devel.x86_64 : Library links and header files for ImageMagick app

                         : development

ImageMagick-doc.x86_64 : ImageMagick html documentation

ImageMagick-perl.x86_64 : ImageMagick perl bindings

GraphicsMagick.i686 : An ImageMagick fork, offering faster image generation and

                    : better quality

GraphicsMagick.x86_64 : An ImageMagick fork, offering faster image generation

                      : and better quality

ImageMagick.i686 : An X application for displaying and manipulating images

ImageMagick.x86_64 : An X application for displaying and manipulating images

php-magickwand.x86_64 : PHP API for ImageMagick

php-pecl-imagick.x86_64 : Provides a wrapper to the ImageMagick library

  Name and summary matches only, use "search all" for everything.