But if You show me high resolution GC scenery, it is possible that I change my opinion.
I'm not interested in changing your opinion [1], I'm interested in making several points for others.
First, a photograph or a screenshot aren't just 'happening', there's an intention behind it and a selection involved. In photography, you select when you push the button, you select what part of a scene is in the picture and what is outside its borders, you select things like exposure and aperture - all based on your intention.
Do you want to make the scene look good? Bad? interesting?
It's easy to make e.g. iconic landmarks like delicate arch or balanced rock quite odd - walk around them, take the picture from the other side.
All that also holds for screenshots where it costs you just a few clicks to try different weather or light. Every photographer will tell you that if you have a landscape relief, you take pictures when the sun is low - because then the lighting brings out a relief. Most Grand Canyon photographs you can admire somewhere are taken when the sun is low.
So - when you compare the impression of reality people have from photographs, or two screenshots taken with good relief shading with one screenshot taken under noon light when the relief is flat - what conclusion will people inevitably make? They will conclude that the noon screenshot looks worse.
Given the quality of submissions for Screenshot of the Month, I have severe trouble to imagine that you're not aware of such a simple thing as the effect of good relief lighting. So there's not many reasons I can imagine for not doing the one mouse click that will give you much better visuals.
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The second point would be that light and weather matters - quite a lot. The same scenery should look compelling under very varied conditions - colors come out differently in direct and indirect light, there's the warm glow of dawn illumination, the hazy diffuse light of an high overcast day, the effect of frost and water on exposed rock.
Yet - whenever we get to see photo-scenery, the weather is always bright and dry. Why is that? Because we've tested it and Richard has posted results from OSGEarth - it doesn't look plausible at all in rainy weather.
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Given these observations, it i quite easy to make FG 'lose' in a screenshot comparison - careful selection will do that for you. But it's equally easy to make FG 'win' a comparison.
Which is - if you really want to *learn* anything rather than feel good because your million dollar commercial product really outperformed the volunteer effort in one situation - you need to sit down and think what a fair comparison actually is and what you might want to learn from it.
[1] You've received the tools to work on FG scenery, you've been given the instructions on the wiki page - you can use that to create something that's better than what is there by default, you can choose to submit that to the repository so that others can enjoy it as well - that would be a positive contribution.
Or you can continue to post FSX and doctored FG screenshots and pat yourself on the shoulder how much better FSX works for you - that would not be a positive contribution.
Your choice.