Android camera color lookup error

Question

I'm trying to implement lookup texture to my live camera preview.Everything looks fine except shine and shadows. The shine appears blueish and shadow sometimes has red spot.

I'm using Grafika's Camera Capture. I have referred GpuImage's Shader. I was able to load second texture (lookup texture) using following load texture function,

public int createTextureObjectN() {
    int[] textures = new int[1];
    GLES20.glGenTextures(1, textures, 0);
    GlUtil.checkGlError("glGenTextures");

    int texId = textures[0];
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId);
    GlUtil.checkGlError("glBindTexture " + texId);

    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
    GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
    GlUtil.checkGlError("glTexParameter");

    return texId;
}

public int loadTexture(final int resourceId) {
    final int texId = createTextureObjectN();
    if (texId != 0) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inScaled = false;   // No pre-scaling

        // Decode
        options.inJustDecodeBounds = false;
        Bitmap bitmap = BitmapFactory.decodeResource(MyApplication.getAppContext().getResources(), resourceId, options);

        // Load the bitmap into the bound texture.
        GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);

        // Recycle the bitmap, since its data has been loaded into OpenGL.
        bitmap.recycle();
    }

    return texId;
}

my vertex shader is

private static final String VERTEX_SHADER =
        "uniform mat4 uMVPMatrix;\n" +
        "uniform mat4 uTexMatrix;\n" +
        "attribute vec4 aPosition;\n" +
        "attribute vec4 aTextureCoord;\n" +
        "varying vec2 vTextureCoord;\n" +
        "void main() {\n" +
        "    gl_Position = uMVPMatrix * aPosition;\n" +
        "    vTextureCoord = (uTexMatrix * aTextureCoord).xy;\n" +
        "}\n";

and fragment shader is shown below. The stexture2 is a lookup and stexture is camera preview frame of dimension 1920x1080 And vTextureCoord is cordinates of camera frames

#extension GL_OES_EGL_image_external : require

uniform samplerExternalOES  sTexture;
uniform sampler2D           sTexture2;
varying vec2                vTextureCoord;
//uniform vec3              iResolution;
//uniform float             iGlobalTime;
//highp float aspectRatio = iResolution[1] / iResolution[0];

lowp float intensity = 1.0;

void main()
{
    highp vec4 textureColor = texture2D(sTexture, vTextureCoord);

    highp float blueColor = textureColor.b * 63.0;

    highp vec2 quad1;
    quad1.y = floor(floor(blueColor) / 8.0);
    quad1.x = floor(blueColor) - (quad1.y * 8.0);

    highp vec2 quad2;
    quad2.y = floor(ceil(blueColor) / 8.0);
    quad2.x = ceil(blueColor) - (quad2.y * 8.0);

    highp vec2 texPos1;
    texPos1.x = (quad1.x * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) * textureColor.r);
    texPos1.y = (quad1.y * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) * textureColor.g);

    highp vec2 texPos2;
   texPos2.x = (quad2.x * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) * textureColor.r);
   texPos2.y = (quad2.y * 0.125) + 0.5/512.0 + ((0.125 - 1.0/512.0) *textureColor.g);

   lowp vec4 newColor1 = texture2D(sTexture2, texPos1);
   lowp vec4 newColor2 = texture2D(sTexture2, texPos2);
   lowp vec4 newColor = mix(newColor1, newColor2, fract(blueColor));

   gl_FragColor =  gl_FragColor  = mix(textureColor, vec4(newColor.rgb, textureColor.w), intensity);   
}

I have been trying to fix this problem since two weeks , hoping to find solution and also have exhausted google searches with all possible keywords. I am new to opengl, and would request help in this particular part.

Thank you for helping me!