Go bindings for GraphicsMagick

Install GraphicsMagick libraries and header files

Windows

• Install msys2-x86_64
• In msys2 shell:

pacman -S mingw-w64-x86_64-gcc
pacman -S mingw-w64-x86_64-zlib
pacman -S mingw-w64-x86_64-pkg-config
pacman -S mingw-w64-x86_64-graphicsmagick

• Add following environment variable:

set PATH=<msys64>\mingw64\bin;%PATH%
set PKG_CONFIG_PATH=<msys64>\mingw64\lib\pkgconfig
set MAGICK_CODER_MODULE_PATH=<msys64>\mingw64\lib\GraphicsMagick-1.3.25\modules-Q8\coders

(BTW: you should change <msys64> to your installation path of msys2)

MacOS

Install GraphicsMagick using Homebrew or MacPorts
An example of MacPorts:

• sudo port install graphicsmagick
• export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig

An example of Homebrew:

• ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
• brew install pkg-config
• brew install graphicsmagick

CentOS

• ensure epel-release was installed. (help)
• yum install GraphicsMagick-devel

Ubuntu

• sudo apt-get install libgraphicsmagick1-dev

Install golang bindings

• go get github.com/gographics/gmagick

Use GraphicsMagick and ImageMagick simultaneously

GraphicsMagick must be recompiled with flag --enable-symbol-prefix

Example

package main

import (
    "flag"
    "github.com/gographics/gmagick"
)

func resize(orig string, dest string) {
    mw := gmagick.NewMagickWand()
    defer mw.Destroy()
    mw.ReadImage(orig)
    w := mw.GetImageWidth()
    h := mw.GetImageHeight()
    mw.ResizeImage(w/2, h/2, gmagick.FILTER_LANCZOS, 1)
    mw.WriteImage(dest)
}

func main() {
    f := flag.String("from", "", "original image file ...")
    t := flag.String("to", "", "target file ...")
    flag.Parse()

    resize(*f, *t)
}