Firstly, it is anything but clear how the former's existence is not contingent upon the latter. That's exactly the point: there can be no non-experiential experience of a property. But most importantly, the words I emphasized in your comments clearly illustrate the contradiction. You're correct, qualia are human concepts, and as such, exists solely therein. Your second statement contradicts your first directly. One can never know whether or not a certain quality is present in the absence of a perceiver because a perceiver is always required to note it.