Only brightness module (#161)

* fixed package.json

Signed-off-by: tech4GT <varun.gupta1798@gmail.com>

* resolves #113 add brightness module

Signed-off-by: tech4GT <varun.gupta1798@gmail.com>

src/modules/Brightness/Module.js

@@ -0,0 +1,57 @@
+/* 
+* Changes the Image Brightness
+*/
+
+module.exports = function Brightness(options,UI){
+    options = options || {};
+    options.title = "Brightness";
+    options.description = "Changes the brightness of the image";
+
+    //Tell the UI that a step has been set up
+    UI.onSetup(options.step);
+    var output;
+
+    function draw(input,callback){
+        
+        // Tell the UI that a step is being drawn
+        UI.onDraw(options.step);
+        
+        var step = this;
+        
+        function changePixel(r, g, b, a){
+            var val = (options.brightness)/100.0
+
+            r = val*r<255?val*r:255
+            g = val*g<255?val*g:255
+            b = val*b<255?val*b:255
+            return [r , g, b, a]
+        }
+        
+        function output(image,datauri,mimetype){
+            
+            // This output is accessible by Image Sequencer
+            step.output = {src:datauri,format:mimetype};
+            
+            // This output is accessible by UI
+            options.step.output = datauri;
+            
+            // Tell UI that step has been drawn.
+            UI.onComplete(options.step);
+        }
+        
+        return require('../_nomodule/PixelManipulation.js')(input, {
+            output: output,
+            changePixel: changePixel,
+            format: input.format,
+            image: options.image,
+            callback: callback
+        });
+        
+    }
+    return {
+        options: options,
+        draw:  draw,
+        output: output,
+        UI: UI
+    }
+}