Believe me, the colors are NOT brighter when using composite, it's the other way around. TOTALLY the other way around. If you compare composite vs rgb in reality (i e not pictures/video) you'll see the massive difference.
Also: I spent $2 total in order to get my PCE to output RGB of perfection. No more, no less.
It's true. Even if the Turbo/PCE's composite was good for it's time, it doesn't change the fact that the color is totally drained from the picture and dithering turns into unnatural colors. I'm no techy spec-head, so I won't try to guess at the causes of the degradation, and it's besides the point.
http://members.shaw.ca/turboduo/svideo.htmlTake a look at the cinema shot with the blonde haired soldier. The two skin tones get 'blended' with an ugly puke green. Regardless of the why's and how's, you get a clear picture with RGB/S-Video that lets you see the real graphics, just as the developer's intended you to never see.
In the case of Forgotten Worlds, Capcom never intended their arcade game to be strained through PC Engine hardware anyway.
The other major thing, is that the colors look vibrant and are similar to emulation.
http://superpcenginegrafx.com/wii_video_temp.htmlIn the link above, if you compare the S-Video screenshots to the emulated ones, they're very similar. Which shows how good the S-Video/RGB mod is.
Further down you can see how colorless the composite Turbo/PCE screenshots look compared to emulation and the Wii. But if you look at the rollover images of the Wii vs Turbo/PCE S-Video they're about the same. Then look at the Wii vs Turbo/PCE composite rollovers. The Wii composite image still looks nice and vibrant, but the Turbo/PCE image looks like it got crossed with a b&w image.
So even if the Turbo/PCE composite was one of the best back in the day, it certainly does kick the crap out of the graphics before they reach the screen, compared to the Wii's composite.
The Turbo/PCE S-Video mod as I understand it, is a hack of the RGB mod. So the RGB will look even better(
not much) on a TV that supports it or when transcoded(
or whatever) into component and played on a TV that supports 240p.
And like Seldane said, on a real TV, the difference is more noticeable than screenshots and photos.