closes #417

examples/thumb.js

@@ -3,10 +3,9 @@
 
 var gm = require('../')
   , dir = __dirname + '/imgs'
-  
+
 gm(dir + '/original.jpg')
   .thumb(150, 50, dir + '/thumb.jpg', function(err){
     if (err) return console.dir(arguments)
     console.log(this.outname + " created  ::  " + arguments[3])
-  }
-) 
+  });

examples/thumbExact.js

@@ -0,0 +1,11 @@
+
+// gm - Copyright Aaron Heckmann <aaron.heckmann+github@gmail.com> (MIT Licensed)
+
+var gm = require('../')
+  , dir = __dirname + '/imgs'
+
+gm(dir + '/original.jpg')
+  .thumbExact(150, 50, dir + '/thumb.jpg', function(err){
+    if (err) return console.dir(arguments)
+    console.log(this.outname + " created  ::  " + arguments[3])
+  });

lib/convenience/thumb.js

@@ -5,11 +5,19 @@
 
 module.exports = function (proto) {
 
-  proto.thumb = function thumb (w, h, name, quality, align, progressive, callback) {
-    var self = this
-      , args = Array.prototype.slice.call(arguments);
+  proto.thumb = function thumb (w, h, name, quality, align, progressive, callback, opts) {
+    var self = this,
+      args = Array.prototype.slice.call(arguments);
+
+    opts = args.pop();
+
+    if (typeof opts === 'function') {
+      callback = opts;
+      opts = '';
+    } else {
+      callback = args.pop();
+    }
 
-    callback = args.pop();
     w = args.shift();
     h = args.shift();
     name = args.shift();
@@ -61,15 +69,24 @@ module.exports = function (proto) {
       self
       .quality(quality)
       .in("-size", w1+"x"+h1)
-      .scale(w1, h1)
+      .scale(w1, h1, opts)
       .crop(w, h, xoffset, yoffset)
       .interlace(interlace)
       .noProfile()
       .write(name, function () {
-        callback.apply(self, arguments)
+        callback.apply(self, arguments);
       });
     });
 
     return self;
-  }
-}
+  };
+
+  proto.thumbExact = function () {
+    var self = this,
+      args = Array.prototype.slice.call(arguments);
+
+    args.push('!');
+
+    self.thumb.apply(self, args);
+  };
+};

test/417.js

@@ -0,0 +1,30 @@
+
+var assert = require('assert')
+var fs = require('fs');
+var path = require('path');
+
+module.exports = function (_, dir, finish, gm) {
+  if (!gm.integration)
+    return finish();
+
+  gm(dir + '/original.jpg')
+  .thumb(150, 40, dir + '/thumb.png', function thumb (err) {
+    gm(dir + '/thumb.png')
+      .size(function (err, size) {
+        if (err) return finish(err);
+
+        assert.equal(142, size.width);
+        assert.equal(40, size.height);
+
+        gm(dir + '/original.jpg')
+        .thumbExact(150, 40, dir + '/thumb.png', function thumb (err) {
+          gm(dir + '/thumb.png')
+            .size(function (err, size) {
+              assert.equal(150, size.width);
+              assert.equal(40, size.height);
+              finish(err);
+            });
+        });
+      });
+  });
+}