> The thing that I find interesting is that there's a bluish tint to the large ring > segments in the photos, whereas there's a yellowish tint to the large ring segments > in MAME. > > Completely turning HLSL off, the colors are accurate to what the system is > generating, but it's an interesting challenge to try to figure out why the segments > appear more white with a bluish tint. > > There are a few potential explanations, but I'm not sure which is the most plausible. > In no particular order: > > - The camera itself may have had a CCD that's more sensitive towards the blue end of > the spectrum. > - The blue phosphors on the CRT itself may have been more vibrant or had a different > wavelength than the model of CRT that the current phosphor values in MAME are tuned > towards. > - The f-number of the camera may have been such that phosphors of a certain > wavelength were overexposed (see the first point). > - There may be unaccounted-for Rayleigh scattering through the CRT glass itself.
I think the blueish tint might be an effect of taking a picture off the CRT so, for the correct colors, it might be better to check some screen grabs taken from a capture card, such as those here: http://nerdlypleasures.blogspot.com/2015/03/the-case-for-composite.html
Also, SMS and other related stuff: http://nerdlypleasures.blogspot.com/2016/07/video-potpourri.html
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