ImageFilter.m

for (int i = 0; i < length; i += 4) {
        blue = m_OriginalPixelBuf[i];
        green = m_OriginalPixelBuf[i+1];
        red = m_OriginalPixelBuf[i+2];
        
        red = pow(red / 255.0f, 1.3f) * 255.0;
        green = pow(green / 255.0f, 1.3f) * 255.0;
        blue = pow(blue / 255.0f, 1.3f) * 255.0;
        
        // Ensure that pixel is not more than 255
        m_OriginalPixelBuf[i] = blue > 255 ? 255 : (int)blue;
        m_OriginalPixelBuf[i+1] = green > 255 ? 255 : (int)green;
        m_OriginalPixelBuf[i+2] = red > 255 ? 255 : (int)red;
}