Do gamma conversion manualy

Requesting sRGB capable framebuffer is unreliable

main.cpp

@@ -15,9 +15,6 @@ int main(int argc, char *argv[])
     format.setMinorVersion(3);
     format.setOption(QSurfaceFormat::DebugContext);
     format.setProfile(QSurfaceFormat::OpenGLContextProfile::CoreProfile);
-#ifdef COLOR_MANAGMENT
-    format.setColorSpace(QSurfaceFormat::sRGBColorSpace);
-#endif
     QSurfaceFormat::setDefaultFormat(format);
 
     QApplication a(argc, argv);