Quote from: pokoy on June 04, 2018, 07:52:44 AM
I don't want to add unnecessary noise to the discussion but since I'm working a lot with real life photography and need TG to produce matching skies/atmospheres I found TG to be pretty realistic out of the box. As Oshyan states, the Ozone parameter has added the last bit of realism, at least for me.
I guess what's missing in the discussion is that converting Wide RGB color space (assuming TG uses a wider space than sRGB internally) to sRGB always comes at the cost of some trade-off and may change how sRGB displays colors, this is especially the case for dark blue / violet / orange / bright yellow tones, blue doesn't seem to be affected much.
Another aspect is that cameras will never work at a neutral white point (6500K for TG I guess) in a natural environment, adding further changes to any image you might be comparing TG's results against. I'm all for an additional Color Temperature parameter in the Frame Buffer as this one could really help to achieve more photo-realistic results.
I'll agree that achieving deep violet sunset colors with TG is a bit difficult without playing with the parameters but Ozone has helped a lot here. With a Color Temperature parameter this could become easier. But the effect is quite a rare occurrence in nature as well and needs some conditions to be met which may be hard or impossible to 'construct' with TG after all.
I live in the straights of Puget Sound by British Columbia, I watch the sun set in the Pacific Ocean with a unobstructed view of the horizon every night. Clear, cloudy, hazy, overcast, etc. And again, according to basic atmospheric science, at any point you have a unobstructed view of the horizon, and the sun in it, all blue and violet light will be cut out. That means you get oranges/reds/pinks. White is even mix between refractions, just like a prism. TG does already, quite well, but it's falloff is too intense, and close to the horizon.
Additionally, like I was talking about in the asphalt topic, this falloff also effects the sky too dramatically. At 8 degree elevation IRL, the sky here is still pretty much bright blue, and the sun a nice yellow hue cast on objects. However in this image we havea duller (somehow; blues should be deeper and richer not drull) sky, and it's too dark for the elevation. This effects reflections, making things darker than they should be due to darker refractions. Also we get a white bath of mixed colours. So much so the sun is masked by the apposing reds and blues into whites at too far of a corona effect. Even I can look at the sun with the naked eye for a moment and notice a sun, and not so much white washing.
This again why I would like to be able to control the intensity of these decays with a slider. It would be a lot more practical than picking colours, for one, and distorting base colour hues, or spending so much time making sure you're within the same colour hue when selecting a new colour.
I feel at this height, the sun should have more colour at it's source, and more colour on the horizon. It is way to white washed and represents no sunset I have EVER seen, watching them my whole life, or any image in the raw, or edited. Just unrealistic altogether. Sure looks nice, and having been seeing nothing but it working it it all the time, I can see how people are easily bias, or unaware of the subtle differences IRL.
Additionally, ozone should be "Fake Ozone" as it doesn't work like ozone. If you up it, it doesn't effect the suns corona glow like it would IRL and give you a visible sun disc... like you'd be able to see anyway at this angle in a clear sky. Maybe TGs haze is too strong at default.