diff --git a/build.gradle b/build.gradle
index 3328f06..d04fe78 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a63833f..a8010f3 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Thu Mar 05 14:42:21 CST 2020
+#Fri Dec 25 20:40:46 CST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
diff --git a/library/src/main/res/raw/beauty.glsl b/library/src/main/res/raw/beauty.glsl
index 1a32a63..141dfe7 100644
--- a/library/src/main/res/raw/beauty.glsl
+++ b/library/src/main/res/raw/beauty.glsl
@@ -1,6 +1,6 @@
 #extension GL_OES_EGL_image_external : require
 
-precision highp float;
+precision mediump float;
 
 uniform samplerExternalOES inputImageTexture;
 uniform vec2 singleStepOffset;
@@ -16,96 +16,141 @@ const mat3 saturateMatrix = mat3(
 
 vec2 blurCoordinates[24];
 
+vec3 rgb2lab(vec3 color) {
+    float L = 0.3811 * color.b + 0.5783 * color.g + 0.0402 * color.r;
+    float M = 0.1967 * color.b + 0.7244 * color.g + 0.0782 * color.r;
+    float S = 0.0241 * color.b + 0.1288 * color.g + 0.8444 * color.r;
+    if (L == 0.0) L = 1.0;
+    if (M == 0.0) M = 1.0;
+    if (S == 0.0) S = 1.0;
+    L = log(L);
+    M = log(M);
+    S = log(S);
+    float ll = (L + M + S) / sqrt(3.0);
+    float aa = (L + M - 2.0 * S) / sqrt(6.0);
+    float bb = (L - M) / sqrt(2.0);
+    return vec3(ll, aa, bb);
+}
+
+vec3 lab2rgb(vec3 lab) {
+    float L = lab.r / sqrt(3.0) + lab.g / sqrt(6.0) + lab.b / sqrt(2.0);
+    float M = lab.r / sqrt(3.0) + lab.g / sqrt(6.0) - lab.b / sqrt(2.0);
+    float S = lab.r / sqrt(3.0) - 2.0 * lab.g / sqrt(6.0);
+    L = exp(L);
+    M = exp(M);
+    S = exp(S);
+    float b = 4.4679 * L - 3.5873 * M + 0.1193 * S;
+    float g = -1.2186 * L + 2.3809 * M - 0.1624 * S;
+    float r = -0.0497 * L - 0.2439 * M + 1.2045 * S;
+    if (b > 1.0) b = 1.0;
+    if (b < 0.0) b = 0.0;
+    if (g > 1.0) g = 1.0;
+    if (g < 0.0) g = 0.0;
+    if (r > 1.0) r = 1.0;
+    if (r < 0.0) r = 0.0;
+    return vec3(r,g,b);
+}
+
+float skinMask(vec3 color) {
+    vec3 lab = rgb2lab(color); // return values in the range [0, 1]
+    float a = smoothstep(0.45, 0.55, lab.g);
+    float b = smoothstep(0.46, 0.54, lab.b);
+    float c = 1.0 - smoothstep(0.9, 1.0, length(lab.gb));
+    float d = 1.0 - smoothstep(0.98, 1.02, lab.r);
+    return min(min(min(a, b), c), d);
+}
+
 float hardLight(float color) {
     if(color <= 0.5) {
         color = color * color * 2.0;
     } else {
-        color = 1.0 - ((1.0 - color)*(1.0 - color) * 2.0);
+        color = 1.0 - ((1.0 - color) * (1.0 - color) * 2.0);
     }
     return color;
 }
 
 void main() {
     vec3 centralColor = texture2D(inputImageTexture, textureCoordinate).rgb;
-
-    blurCoordinates[0] = textureCoordinate.xy + singleStepOffset * vec2(0.0, -10.0);
-    blurCoordinates[1] = textureCoordinate.xy + singleStepOffset * vec2(0.0, 10.0);
-    blurCoordinates[2] = textureCoordinate.xy + singleStepOffset * vec2(-10.0, 0.0);
-    blurCoordinates[3] = textureCoordinate.xy + singleStepOffset * vec2(10.0, 0.0);
-    blurCoordinates[4] = textureCoordinate.xy + singleStepOffset * vec2(5.0, -8.0);
-    blurCoordinates[5] = textureCoordinate.xy + singleStepOffset * vec2(5.0, 8.0);
-    blurCoordinates[6] = textureCoordinate.xy + singleStepOffset * vec2(-5.0, 8.0);
-    blurCoordinates[7] = textureCoordinate.xy + singleStepOffset * vec2(-5.0, -8.0);
-    blurCoordinates[8] = textureCoordinate.xy + singleStepOffset * vec2(8.0, -5.0);
-    blurCoordinates[9] = textureCoordinate.xy + singleStepOffset * vec2(8.0, 5.0);
-    blurCoordinates[10] = textureCoordinate.xy + singleStepOffset * vec2(-8.0, 5.0);
-    blurCoordinates[11] = textureCoordinate.xy + singleStepOffset * vec2(-8.0, -5.0);
-    blurCoordinates[12] = textureCoordinate.xy + singleStepOffset * vec2(0.0, -6.0);
-    blurCoordinates[13] = textureCoordinate.xy + singleStepOffset * vec2(0.0, 6.0);
-    blurCoordinates[14] = textureCoordinate.xy + singleStepOffset * vec2(6.0, 0.0);
-    blurCoordinates[15] = textureCoordinate.xy + singleStepOffset * vec2(-6.0, 0.0);
-    blurCoordinates[16] = textureCoordinate.xy + singleStepOffset * vec2(-4.0, -4.0);
-    blurCoordinates[17] = textureCoordinate.xy + singleStepOffset * vec2(-4.0, 4.0);
-    blurCoordinates[18] = textureCoordinate.xy + singleStepOffset * vec2(4.0, -4.0);
-    blurCoordinates[19] = textureCoordinate.xy + singleStepOffset * vec2(4.0, 4.0);
-    blurCoordinates[20] = textureCoordinate.xy + singleStepOffset * vec2(-2.0, -2.0);
-    blurCoordinates[21] = textureCoordinate.xy + singleStepOffset * vec2(-2.0, 2.0);
-    blurCoordinates[22] = textureCoordinate.xy + singleStepOffset * vec2(2.0, -2.0);
-    blurCoordinates[23] = textureCoordinate.xy + singleStepOffset * vec2(2.0, 2.0);
-
-    float sampleColor = centralColor.g * 22.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[0]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[1]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[2]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[3]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[4]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[5]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[6]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[7]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[8]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[9]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[10]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[11]).g;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[12]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[13]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[14]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[15]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[16]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[17]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[18]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[19]).g * 2.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[20]).g * 3.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[21]).g * 3.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[22]).g * 3.0;
-    sampleColor += texture2D(inputImageTexture, blurCoordinates[23]).g * 3.0;
-    sampleColor = sampleColor / 62.0;
-
-    float highPass = centralColor.g - sampleColor + 0.5;
-
-    for(int i = 0; i < 5;i++)
-    {
-        highPass = hardLight(highPass);
+    //float mask = skinMask(centralColor);
+    if (true) {
+        blurCoordinates[0] = textureCoordinate.xy + singleStepOffset * vec2(0.0, -10.0);
+        blurCoordinates[1] = textureCoordinate.xy + singleStepOffset * vec2(0.0, 10.0);
+        blurCoordinates[2] = textureCoordinate.xy + singleStepOffset * vec2(-10.0, 0.0);
+        blurCoordinates[3] = textureCoordinate.xy + singleStepOffset * vec2(10.0, 0.0);
+        blurCoordinates[4] = textureCoordinate.xy + singleStepOffset * vec2(5.0, -8.0);
+        blurCoordinates[5] = textureCoordinate.xy + singleStepOffset * vec2(5.0, 8.0);
+        blurCoordinates[6] = textureCoordinate.xy + singleStepOffset * vec2(-5.0, 8.0);
+        blurCoordinates[7] = textureCoordinate.xy + singleStepOffset * vec2(-5.0, -8.0);
+        blurCoordinates[8] = textureCoordinate.xy + singleStepOffset * vec2(8.0, -5.0);
+        blurCoordinates[9] = textureCoordinate.xy + singleStepOffset * vec2(8.0, 5.0);
+        blurCoordinates[10] = textureCoordinate.xy + singleStepOffset * vec2(-8.0, 5.0);
+        blurCoordinates[11] = textureCoordinate.xy + singleStepOffset * vec2(-8.0, -5.0);
+        blurCoordinates[12] = textureCoordinate.xy + singleStepOffset * vec2(0.0, -6.0);
+        blurCoordinates[13] = textureCoordinate.xy + singleStepOffset * vec2(0.0, 6.0);
+        blurCoordinates[14] = textureCoordinate.xy + singleStepOffset * vec2(6.0, 0.0);
+        blurCoordinates[15] = textureCoordinate.xy + singleStepOffset * vec2(-6.0, 0.0);
+        blurCoordinates[16] = textureCoordinate.xy + singleStepOffset * vec2(-4.0, -4.0);
+        blurCoordinates[17] = textureCoordinate.xy + singleStepOffset * vec2(-4.0, 4.0);
+        blurCoordinates[18] = textureCoordinate.xy + singleStepOffset * vec2(4.0, -4.0);
+        blurCoordinates[19] = textureCoordinate.xy + singleStepOffset * vec2(4.0, 4.0);
+        blurCoordinates[20] = textureCoordinate.xy + singleStepOffset * vec2(-2.0, -2.0);
+        blurCoordinates[21] = textureCoordinate.xy + singleStepOffset * vec2(-2.0, 2.0);
+        blurCoordinates[22] = textureCoordinate.xy + singleStepOffset * vec2(2.0, -2.0);
+        blurCoordinates[23] = textureCoordinate.xy + singleStepOffset * vec2(2.0, 2.0);
+
+        float sampleColor = centralColor.g * 22.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[0]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[1]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[2]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[3]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[4]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[5]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[6]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[7]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[8]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[9]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[10]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[11]).g;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[12]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[13]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[14]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[15]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[16]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[17]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[18]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[19]).g * 2.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[20]).g * 3.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[21]).g * 3.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[22]).g * 3.0;
+        sampleColor += texture2D(inputImageTexture, blurCoordinates[23]).g * 3.0;
+        sampleColor = sampleColor / 62.0;
+
+        float highPass = centralColor.g - sampleColor + 0.5;
+        for (int i = 0; i < 5; i++) {
+            highPass = hardLight(highPass);
+        }
+        float luminance = dot(centralColor, W);
+        float alpha = pow(luminance, params.r);
+
+        vec3 smoothColor = centralColor + (centralColor-vec3(highPass))*alpha*0.1;
+
+        smoothColor.r = clamp(pow(smoothColor.r, params.g), 0.0, 1.0);
+        smoothColor.g = clamp(pow(smoothColor.g, params.g), 0.0, 1.0);
+        smoothColor.b = clamp(pow(smoothColor.b, params.g), 0.0, 1.0);
+
+        vec3 screen = vec3(1.0) - (vec3(1.0)-smoothColor) * (vec3(1.0)-centralColor);
+        vec3 lighten = max(smoothColor, centralColor);
+        vec3 softLight = 2.0 * centralColor*smoothColor + centralColor*centralColor
+        - 2.0 * centralColor*centralColor * smoothColor;
+
+        gl_FragColor = vec4(mix(centralColor, screen, alpha), 1.0);
+        gl_FragColor.rgb = mix(gl_FragColor.rgb, lighten, alpha);
+        gl_FragColor.rgb = mix(gl_FragColor.rgb, softLight, params.b);
+
+        vec3 satColor = gl_FragColor.rgb * saturateMatrix;
+        gl_FragColor.rgb = mix(gl_FragColor.rgb, satColor, params.a);
+        gl_FragColor.rgb = vec3(gl_FragColor.rgb + vec3(-0.096));
+    } else {
+        gl_FragColor.rgb = centralColor;
     }
-    float luminance = dot(centralColor, W);
-    float alpha = pow(luminance, params.r);
-
-    vec3 smoothColor = centralColor + (centralColor-vec3(highPass))*alpha*0.1;
-
-    smoothColor.r = clamp(pow(smoothColor.r, params.g),0.0,1.0);
-    smoothColor.g = clamp(pow(smoothColor.g, params.g),0.0,1.0);
-    smoothColor.b = clamp(pow(smoothColor.b, params.g),0.0,1.0);
-
-    vec3 screen = vec3(1.0) - (vec3(1.0)-smoothColor) * (vec3(1.0)-centralColor);
-    vec3 lighten = max(smoothColor, centralColor);
-    vec3 softLight = 2.0 * centralColor*smoothColor + centralColor*centralColor
-                     - 2.0 * centralColor*centralColor * smoothColor;
-
-    gl_FragColor = vec4(mix(centralColor, screen, alpha), 1.0);
-    gl_FragColor.rgb = mix(gl_FragColor.rgb, lighten, alpha);
-    gl_FragColor.rgb = mix(gl_FragColor.rgb, softLight, params.b);
-
-    vec3 satColor = gl_FragColor.rgb * saturateMatrix;
-    gl_FragColor.rgb = mix(gl_FragColor.rgb, satColor, params.a);
-
-    gl_FragColor.rgb = vec3(gl_FragColor.rgb + vec3(-0.096));
 }
\ No newline at end of file