Merge pull request #32 from Kartikeya99/ignoredBox

Fixed bug when dimensions aren't same

Author: puneet0191

Diff for: README.md

@@ -101,10 +101,11 @@ Scenario('Compare CPU Usage Images', async (I) => {
     I.seeVisualDiffForElement("//div[@class='panel-container']", "Complete_Dashboard_Image.png", {prepareBaseImage: false, tolerance: 3});
 });
 ```
+>Note: `seeVisualDiff` and `seeVisualDiffElement` work only when the dimensions of the screenshot as well as the base image are same so as to avoid unexpected results.
 
 ### Ignored Box
 You can also exclude part of the image from comparison, by specifying the excluded area in pixels from the top left.
-Just declare an object and pass it options as `ignoredBox`:
+Just declare an object and pass it in options as `ignoredBox`:
 ```
 const box = {
     left: 0,

Diff for: index.js

@@ -39,6 +39,7 @@ class ResembleHelper extends Helper {
         if (err) {
           reject(err);
         } else {
+          if(!data.isSameDimensions) throw new Error("The images are not of same dimensions. Please use images of same dimensions so as to avoid any unexpected results.")
           resolve(data);
           if (data.misMatchPercentage >= tolerance) {
             mkdirp(getDirName(this.config.diffFolder + diffImage), function (err) {