diff --git a/src/comparison.coffee b/src/comparison.coffee
index 8d75e00..99f843b 100644
--- a/src/comparison.coffee
+++ b/src/comparison.coffee
@@ -15,7 +15,6 @@ class Comparison
     fileData = _.values(@images)
 
     Comparison.compare fileData[0], fileData[1], (diffObj) -> 
-      
       if diffObj
         diffBase64 = diffObj.getImageDataUrl().replace('data:image/png;base64,', '')
         that.images.diff = new Buffer diffBase64, 'base64'
@@ -30,8 +29,7 @@ class Comparison
     defer.promise()
 
   @compare: (fileAData, fileBData, callback) ->
-    defer = mr.Deferred()
-    defer.done callback
+    defer = mr.Deferred().done callback
 
     resemble(fileAData).compareTo(fileBData).onComplete (data) ->
       defer.resolve data
diff --git a/src/console.status.coffee b/src/console.status.coffee
index ca6fe65..a2fefee 100644
--- a/src/console.status.coffee
+++ b/src/console.status.coffee
@@ -19,11 +19,11 @@ module.exports = (viff) ->
       currentBrowserName = _case.browser
       console.log "#{currentBrowserName.info}"
 
-    caseName = Viff.getPathKey _case.url
+    caseName = Viff.getCaseKey _case
     caseDuration += duration
 
     if currentCaseName isnt caseName
-      console.log "#{Viff.getPathKey _case.url} (#{durationFormat(duration)})"
+      console.log "#{Viff.getCaseKey _case} (#{durationFormat(duration)})"
       currentCaseName = caseName
       caseDuration = 0
 
diff --git a/src/image.generator.coffee b/src/image.generator.coffee
index f6dc768..2fbe2f8 100644
--- a/src/image.generator.coffee
+++ b/src/image.generator.coffee
@@ -7,8 +7,8 @@ wrench = require 'wrench'
 
 Viff = require './viff'
 
-preprocessFolderName = (name) ->
-  encodeURIComponent Viff.getPathKey name
+preprocessFolderName = (_case) ->
+  encodeURIComponent Viff.getCaseKey _case
 
 currentRunningDirname = process.cwd()
 screenshotPath = path.join currentRunningDirname, './screenshots'
@@ -46,11 +46,11 @@ _.extend ImageGenerator,
 
   generateByCase: (_case) ->
     browserFolderPath = path.join screenshotPath, _case.browser
-    urlFolderPath = path.join browserFolderPath, preprocessFolderName(_case.url)
+    urlFolderPath = path.join browserFolderPath, preprocessFolderName(_case)
 
     ImageGenerator.createFolder browserFolderPath
     ImageGenerator.createFolder urlFolderPath
-
+    
     _.each _case.result.images, (img, env) ->
       imagePath = path.join(urlFolderPath, env + '.png')
       ImageGenerator.createImageFile imagePath, img
@@ -63,7 +63,7 @@ _.extend ImageGenerator,
 
     _.each cases, (_case) ->
       if _case.result
-        path = Viff.getPathKey _case.url
+        path = Viff.getCaseKey _case
         compares[_case.browser] = compares[_case.browser] || {}
         compares[_case.browser][path] = _case.result
 
diff --git a/src/viff.coffee b/src/viff.coffee
index 9052c76..a8efa55 100644
--- a/src/viff.coffee
+++ b/src/viff.coffee
@@ -42,7 +42,7 @@ class Viff extends EventEmitter
 
       return
     ).addErrback (ex) ->
-      console.error "ERROR: For path #{url} with selector #{selector||''}, #{ex.message.split('\n')[0]}"
+      console.error "ERROR: For path #{util.inspect(url)} with selector #{selector||''}, #{ex.message.split('\n')[0]}"
       defer.resolve ''
 
     defer.promise()
@@ -64,14 +64,15 @@ class Viff extends EventEmitter
     _.each links, (url) ->
       _.each browsers, (browser) ->
 
-        if _.contains(browser, ':')
-          [browserFrom, browserTo] = browser.split ':'
+        if _.contains(browser, '-')
+          [browserFrom, browserTo] = browser.split '-'
 
           _.each envHosts, (host, envName) ->
             cases.push Viff.constructCase browser, browserFrom, browserTo, host, host, envName, envName, url
         else
           [[from, envFromHost], [to, envToHost]] = _.pairs envHosts
           cases.push Viff.constructCase browser, browser, browser, envFromHost, envToHost, from, to, url
+
     cases
 
   takeScreenshots: (browsers, envHosts, links, callback) ->
@@ -84,9 +85,7 @@ class Viff extends EventEmitter
     mr.asynEach(cases, (_case) ->
       iterator = this
 
-      path = Viff.getPathKey _case.url
       startcase = Date.now()
-
       that.takeScreenshot _case.from.browser, _case.from.host, _case.url, (fromImage, fromImgEx) ->
         that.takeScreenshot _case.to.browser, _case.to.host, _case.url, (toImage, toImgEx) ->
 
@@ -94,7 +93,7 @@ class Viff extends EventEmitter
             that.emit 'afterEach', _case, 0
             iterator.next()
           else 
-            imgWithEnvs = _.object [[_case.from.name, fromImage], [_case.to.name, toImage]]
+            imgWithEnvs = _.object [[_case.from.browser + '-' + _case.from.name, fromImage], [_case.to.browser + '-' + _case.to.name, toImage]]
             comparison = new Comparison imgWithEnvs
             
             comparison.diff (diffImg) ->
@@ -104,7 +103,7 @@ class Viff extends EventEmitter
               iterator.next()
     , -> 
       endTime = Date.now() - start
-      that.drivers[browser].quit() for browser in browsers
+      # that.drivers[browser].quit() for browser in browsers
       that.emit 'after', cases, endTime
 
       defer.resolve cases, endTime
@@ -120,6 +119,13 @@ class Viff extends EventEmitter
       path = "#{path} (#{selector})" if _.isString selector
     path
 
+  @getCaseKey: (_case) ->
+    path = Viff.getPathKey _case.url
+    if _case.from.name is _case.to.name
+      path = _case.from.name + ':' + path
+
+    path
+
   @dealWithPartial: (base64Img, driver, selector, callback) ->
     defer = mr.Deferred().done callback
 
diff --git a/test/src/image_generator_test.coffee b/test/src/image_generator_test.coffee
index 4c5c7ae..300adb5 100644
--- a/test/src/image_generator_test.coffee
+++ b/test/src/image_generator_test.coffee
@@ -33,10 +33,14 @@ module.exports =
     c = 
       browser: 'firefox'
       url: '/link1'
-      fromname: 'build'
-      toname: 'prod'
-      from: { 'build': 'http://localhost:4000' }
-      to: { 'prod': 'http://localhost:4001' }
+      from:
+        browser: 'firefox'
+        name: 'build' 
+        host: 'http://localhost:4000'
+      to: 
+        browser: 'firefox'
+        name: 'prod'
+        host: 'http://localhost:4001'
       result:
         images:
           build: 'ABCD'
@@ -56,3 +60,34 @@ module.exports =
     test.ok @writeFileSync.firstCall.args[0].indexOf('/viff/screenshots/firefox/%2Flink1/build.png') >= 0
     test.done()
 
+  'it could generate images by case when comparing cross browsers': (test) ->
+    c = 
+      browser: 'firefox:safari'
+      url: '/link1'
+      from:
+        browser: 'firefox'
+        name: 'build' 
+        host: 'http://localhost:4000'
+      to: 
+        browser: 'safari'
+        name: 'build'
+        host: 'http://localhost:4000'
+      result:
+        images:
+          'firefox-build': 'ABCD'
+          'safari-build': 'EFGH'
+          diff: 'IJKL'
+        isSameDimensions: true
+        misMatchPercentage: 0.2
+        analysisTime: 2000
+    
+    @existsSync = @existsSync.returns false
+
+    ImageGenerator.generateByCase c
+
+    test.ok @mkdirSync.firstCall.args[0].indexOf('/viff/screenshots/firefox:safari') >= 0
+    test.ok @mkdirSync.secondCall.args[0].indexOf('/viff/screenshots/firefox:safari/build%3A%2Flink1') >= 0
+    test.equals @writeFileSync.callCount, 3
+    test.ok @writeFileSync.firstCall.args[0].indexOf('/viff/screenshots/firefox:safari/build%3A%2Flink1/firefox-build.png') >= 0
+    test.done()
+
diff --git a/test/src/viff_test.coffee b/test/src/viff_test.coffee
index 4c02015..979b5d0 100644
--- a/test/src/viff_test.coffee
+++ b/test/src/viff_test.coffee
@@ -238,7 +238,7 @@ module.exports =
     test.done()
 
   'it should construct cases when set comparing cross browsers': (test) ->
-    browsers = ['chrome:firefox', 'firefox'];
+    browsers = ['chrome-firefox', 'firefox'];
     cases = Viff.constructCases(browsers, @config.compare, @links)
     cases.length.should.equal 6
     _.first(cases).from.name.should.equal 'build'