Here goes with some background. Thread. This is what Vectorman looked like on the Sega Genesis/Megadrive. Except it didn't, really.pic.twitter.com/V5OCyvkwGr
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Graphics peeps: Could Rayleigh scattering cause a visible hue shift in an image viewed on a CRT monitor, either to the eye or in a photo?
Presumably, the glass used in CRTs is intended to be an ideal transmission medium, but in real life, nothing's ever 100% ideal.
@Atrix256
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Note the yellowish hue of the large segments of the roughly screen-sized circle. This is important. This is what it looks like with the D3D9 HLSL pipe in MAME, with a composite NTSC shader, plus scanlines, plus phosphor chromaticity, plus distortion, everything else at identity.pic.twitter.com/wiqiR5nEN5
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Note also that the NTSC shader provides color fringing on sharp chroma/white transitions due to limited bandwidth, while also achieving the fake translucency and additional color depth that contemporary Genesis/Megadrive coders used to achieve a higher virtual color depth.
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Now here's the rub: These are pictures of Vectorman running on an actual CRT.pic.twitter.com/RHHR20H0jn
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Close. Damn close, in fact. But not quite. Putting aside the difference in luminance - which is far closer when enabling the bloom pass in MAME's D3D9/HLSL pipeline - the most striking thing to me is that everything has a shift towards the blue end of the spectrum.
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Those segments I referred to? They're nearly white. The green sphere sprites are obviously tinted more towards aquamarine. This brings up a number of questions in my mind, thoughts on how this might be the case, and I'm not sure which is the most plausible.
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I didn't take the pics, so I don't have first-hand knowledge of the actual look, but: - As
@ewzzy points out, perhaps the camera just has a colder white balance. - The camera might have a CCD that's more sensitive towards blue hues.Näytä tämä ketju -
- The CRT tint knob might be off. - The CRT's blue phosphors may be more vibrant or have a different wavelength than the CRT that the current phosphor sim in MAME is tuned to. - The f-number of the camera may have been such that phosphors of a certain wavelength were overexposed.
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Lastly, but what I'm most interested in, is I wonder if there's the potential for Rayleigh scattering through the glass medium used in CRTs, which might cause images viewed through it to exhibit a certain natural tint. So, graphics Twitter. Thoughts?
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Given you’re on the axis wouldn’t Rayleigh push towards red?
Kiitos. Käytämme tätä aikajanasi parantamiseen. KumoaKumoa
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