Quote:
Originally Posted by gregbradley
Even so the red Photoshop assigns then is not as deep as what you see
through the filter.
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Correct.
It is important to understand monitors (regardless of software) are physically incapable of displaying a wavelength longer than the emission of their red pixels, and can only use a narrow sub-set of all the colours visible to the human eye.
Depending on the monitor, all deep reds eg, H-Alpha 652nm and 672 (SII) can only be represented by the lower limit of the hardware, typically 620nm...which is significantly more "orange" than the reality.