[yagosaga]

Some more remarks regarding mechanical colour tv which might be of interest: I have compared the colors of Darryl's RGB LED array picture on the Nipkow disk with the colors on a screen of a PAL color tv set, both feed with the same test patterns.

Green of the LEDs seems to be much "deeper" and saturated than the green on the CRT screen, and also red of the LEDs seems to be much "deeper" and saturated than the red on the CRT screen. The LEDs seems to provide a wider gamut than the colors of the CRT.

This obeservation was confirmed by the actual values for the wavelengths of the RGB LEDs of mechanical television:

632nm (red)
523nm (green)
465nm (blue)

This seems to be more similar to the wavelengths of the early NTSC color picture tubes than with PAL (except of blue)

636 to 658nm (red)
523 to 532nm (green)
442 to 452nm (blue)

For comparison PAL/SECAM dominant wavelength (these values are estimated from the color space triangle):

607nm (red)
552nm (green)
466nm (blue)

In the attachment are the wavelengths for the early wide gamut NTSC tubes 15GP22 and 21AXP22. Note that 1 Angstrom is 0.1 nm.

Eckhard