Don't confuse "Brightness" which is a perceptual construct with "Contrast". Contrast is the control associated with Luminance -- not Brightness. I would tend to disagree with what can be seen at a lower Luminance level for the visual system is infinitely adaptable to light levels. I would not agree with a statement like "less shadow details" at lower luminance, that's just not true. Roger -----Original Message----- From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Ivan Kadomin Sent: February-03-12 3:11 AM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Re: Monitor calibration > Another issue with having brightness too low is that you might have a > monitor that cannot 'natively' display such a low brightness and needs > to adjust other parameters in order to allow for such a low brightness. This is the case with my U2410, even when Brightness = 0 in OSD menu its brightness is about 117 (or 105, I can't recall exactly, something > 100) cd/m^2. Best regards, Ivan