diff --git a/README.md b/README.md
index 185e9b6..3544a40 100644
--- a/README.md
+++ b/README.md
@@ -173,6 +173,10 @@ The `options` argument can have following values:
         blur:           optional. ex: 0.8
         strip:          optional. default: false. strips comments out from image.
         rotate:         optional. degrees.
+        brightness:     optional. -100-100 integer.
+        contrast:       optional. -100-100 integer.
+        opacity:        optional. 0-100 integer.
+        opacityColor:   optional. String: x11color.
         flip:           optional. vertical flip, true or false.
         autoOrient:     optional. default: false. Auto rotate and flip using orientation info.
         colorspace:     optional. String: Out file use that colorspace ['CMYK', 'sRGB', ...]
diff --git a/src/imagemagick.cc b/src/imagemagick.cc
index 1e7c718..a4b6019 100644
--- a/src/imagemagick.cc
+++ b/src/imagemagick.cc
@@ -81,6 +81,7 @@ struct convert_im_ctx : im_ctx_base {
     unsigned int height;
     unsigned int xoffset;
     unsigned int yoffset;
+    unsigned int opacity;
     bool strip;
     bool trim;
     bool autoOrient;
@@ -91,6 +92,10 @@ struct convert_im_ctx : im_ctx_base {
     std::string filter;
     std::string blur;
     std::string background;
+    std::string brightness;
+    std::string contrast;
+    std::string fuzz;
+    std::string opacityColor;
     Magick::ColorspaceType colorspace;
     unsigned int quality;
     int rotate;
@@ -248,6 +253,14 @@ void DoConvert(uv_work_t* req) {
         image.strip();
     }
 
+    if (context->opacity) {
+        unsigned int opacity = context->opacity;
+        Magick::Color penColor = context->opacityColor;
+
+        if (debug) printf( "opacity: %d\n", opacity );
+        image.colorize(opacity, penColor);
+    }
+
     if ( context->trim ) {
         if (debug) printf( "trim: true\n" );
         double trimFuzz = context->trimFuzz;
@@ -302,6 +315,30 @@ void DoConvert(uv_work_t* req) {
             return;
         }
     }
+    if( ! context->contrast.empty() && ! context->brightness.empty()) {
+        double contrast = atof (context->contrast.c_str());
+        if (debug) printf( "contrast: %.1f\n", contrast );
+        double brightness = atof (context->brightness.c_str());
+        if (debug) printf( "brightness: %.1f\n", brightness );
+        //image.blur(0, blur);
+        image.brightnessContrast(brightness, contrast);
+    }
+    else if( ! context->contrast.empty() && context->brightness.empty()) {
+        double contrast = atof (context->contrast.c_str());
+        if (debug) printf( "contrast: %.1f\n", contrast );
+        double brightness = 0.0;
+        if (debug) printf( "brightness: %.1f\n", brightness );
+        //image.blur(0, blur);
+        image.brightnessContrast(brightness, contrast);
+    }
+    else if(context->contrast.empty() && ! context->brightness.empty()) {
+        double contrast = 0.0;
+        if (debug) printf( "contrast: %.1f\n", contrast );
+        double brightness = atof (context->brightness.c_str());
+        if (debug) printf( "brightness: %.1f\n", brightness );
+        //image.blur(0, blur);
+        image.brightnessContrast(brightness, contrast);
+    }
 
     if( ! context->blur.empty() ) {
         double blur = atof (context->blur.c_str());
@@ -598,6 +635,7 @@ NAN_METHOD(Convert) {
     context->srcData = Buffer::Data(srcData);
     context->length = Buffer::Length(srcData);
     context->debug = obj->Get( Nan::New<String>("debug").ToLocalChecked() )->Uint32Value();
+    context->opacity = obj->Get( Nan::New<String>("opacity").ToLocalChecked() )->Uint32Value();
     context->ignoreWarnings = obj->Get( Nan::New<String>("ignoreWarnings").ToLocalChecked() )->Uint32Value();
     context->maxMemory = obj->Get( Nan::New<String>("maxMemory").ToLocalChecked() )->Uint32Value();
     context->width = obj->Get( Nan::New<String>("width").ToLocalChecked() )->Uint32Value();
@@ -630,6 +668,30 @@ NAN_METHOD(Convert) {
         context->blur = strs.str();
     }
 
+     // manage brightness as string for detect is empty
+    Local<Value> brightnessValue = obj->Get( Nan::New<String>("brightness").ToLocalChecked() );
+    context->brightness = "";
+    if ( ! brightnessValue->IsUndefined() ) {
+        double brightnessD = brightnessValue->NumberValue();
+        std::ostringstream strs;
+        strs << brightnessD;
+        context->brightness = strs.str();
+    }
+
+    // manage contrast as string for detect is empty
+    Local<Value> contrastValue = obj->Get( Nan::New<String>("contrast").ToLocalChecked() );
+    context->contrast = "";
+    if ( ! contrastValue->IsUndefined() ) {
+        double contrastD = contrastValue->NumberValue();
+        std::ostringstream strs;
+        strs << contrastD;
+        context->contrast = strs.str();
+    }
+
+    Local<Value> opacityColorValue = obj->Get( Nan::New<String>("opacityColor").ToLocalChecked() );
+        context->opacityColor = !opacityColorValue->IsUndefined() ?
+            *String::Utf8Value(opacityColorValue) : "transparent";
+
     Local<Value> resizeStyleValue = obj->Get( Nan::New<String>("resizeStyle").ToLocalChecked() );
     context->resizeStyle = !resizeStyleValue->IsUndefined() ?
         *String::Utf8Value(resizeStyleValue) : "aspectfill";
diff --git a/test/test.brightness.js b/test/test.brightness.js
new file mode 100644
index 0000000..6d4916a
--- /dev/null
+++ b/test/test.brightness.js
@@ -0,0 +1,46 @@
+var test        = require('tap').test
+    ,   imagemagick = require('..')
+    ,   debug       = true
+;
+
+process.chdir(__dirname);
+
+console.log("image magick's version is: " + imagemagick.version());
+var versions = imagemagick.version().split(".");
+
+function saveToFileIfDebug (buffer, file) {
+    if (debug) {
+        require('fs').writeFileSync( file, buffer, 'binary' );
+        console.log( "wrote file: "+file );
+    }
+}
+
+test( 'convert brightness to 100', function (t) {
+    var buffer = imagemagick.convert({
+        srcData: require('fs').readFileSync( "test.png" ), // 58x66
+        width: 100,
+        height: 100,
+        quality: 80,
+        format: 'PNG',
+        brightness: 100,
+        debug: debug
+    });
+    t.equal( Buffer.isBuffer(buffer), true, 'buffer is Buffer' );
+    saveToFileIfDebug( buffer, "out.png-brightness-high.png" );
+    t.end();
+});
+
+test( 'convert brightness to -100', function (t) {
+    var buffer = imagemagick.convert({
+        srcData: require('fs').readFileSync( "test.png" ), // 58x66
+        width: 100,
+        height: 100,
+        quality: 80,
+        format: 'PNG',
+        brightness: -100,
+        debug: debug
+    });
+    t.equal( Buffer.isBuffer(buffer), true, 'buffer is Buffer' );
+    saveToFileIfDebug( buffer, "out.png-brightness-low.png" );
+    t.end();
+});
\ No newline at end of file
diff --git a/test/test.contrast.js b/test/test.contrast.js
new file mode 100644
index 0000000..4878fce
--- /dev/null
+++ b/test/test.contrast.js
@@ -0,0 +1,46 @@
+var test        = require('tap').test
+    ,   imagemagick = require('..')
+    ,   debug       = true
+;
+
+process.chdir(__dirname);
+
+console.log("image magick's version is: " + imagemagick.version());
+var versions = imagemagick.version().split(".");
+
+function saveToFileIfDebug (buffer, file) {
+    if (debug) {
+        require('fs').writeFileSync( file, buffer, 'binary' );
+        console.log( "wrote file: "+file );
+    }
+}
+
+test( 'convert contrast to 100', function (t) {
+    var buffer = imagemagick.convert({
+        srcData: require('fs').readFileSync( "test.png" ), // 58x66
+        width: 100,
+        height: 100,
+        quality: 80,
+        format: 'PNG',
+        contrast: 100,
+        debug: debug
+    });
+    t.equal( Buffer.isBuffer(buffer), true, 'buffer is Buffer' );
+    saveToFileIfDebug( buffer, "out.png-contrast-high.png" );
+    t.end();
+});
+
+test( 'convert contrast to -100', function (t) {
+    var buffer = imagemagick.convert({
+        srcData: require('fs').readFileSync( "test.png" ), // 58x66
+        width: 100,
+        height: 100,
+        quality: 80,
+        format: 'PNG',
+        contrast: -100,
+        debug: debug
+    });
+    t.equal( Buffer.isBuffer(buffer), true, 'buffer is Buffer' );
+    saveToFileIfDebug( buffer, "out.png-contrast-low.png" );
+    t.end();
+});
\ No newline at end of file
diff --git a/test/test.opacity.js b/test/test.opacity.js
new file mode 100644
index 0000000..c030196
--- /dev/null
+++ b/test/test.opacity.js
@@ -0,0 +1,49 @@
+var test        = require('tap').test
+    ,   imagemagick = require('..')
+    ,   debug       = true
+;
+
+process.chdir(__dirname);
+
+console.log("image magick's version is: " + imagemagick.version());
+var versions = imagemagick.version().split(".");
+
+function saveToFileIfDebug (buffer, file) {
+    if (debug) {
+        require('fs').writeFileSync( file, buffer, 'binary' );
+        console.log( "wrote file: "+file );
+    }
+}
+
+test( 'convert opacity transparent', function (t) {
+    var buffer = imagemagick.convert({
+        srcData: require('fs').readFileSync( "test.opacity.png" ), // 58x66
+        width: 100,
+        height: 100,
+        quality: 80,
+        format: 'PNG',
+        opacity: 40,
+        debug: debug
+    });
+    t.equal( Buffer.isBuffer(buffer), true, 'buffer is Buffer' );
+    saveToFileIfDebug( buffer, "out.png-opacity-transparent.png" );
+    t.end();
+});
+
+test( 'convert opacity color', function (t) {
+    var buffer = imagemagick.convert({
+        srcData: require('fs').readFileSync( "test.opacity.png" ), // 58x66
+        blur: 0,
+        rotate: 0,
+        brightness: 0,
+        contrast: 0,
+        opacity: 75,
+        opacityColor: '#FF0000',
+        debug: true,
+        ignoreWarnings: true
+    });
+    t.equal( Buffer.isBuffer(buffer), true, 'buffer is Buffer' );
+    saveToFileIfDebug( buffer, "out.png-opacity-color.png" );
+    t.end();
+});
+