nodejs 图片操作：缩小

dnf install GraphicsMagick.i686

cd  nodejs

npm install gm

=================================================================================================

var gm = require("gm")

gm('./IMG_6663.JPG')
.size(function (err, size) {
  if (!err)
    console.log(size.width > size.height ? 'wider' : 'taller than you');
  console.log('size: %d', size.width);
});

gm('./IMG_6663.JPG')
.resize(150,150,'!')
.autoOrient()
.write('./1.jpg',function(err){
  if (err) {
    console.log(err);
  }
})