Benq SW2700PT sRGB mode gamma - no linear section

[richardj21724418]

I'd been wondering why images appear to be higher contrast in sRGB mode on my Benq SW2700PT monitor than in AdobeRGB mode.  On investigaton I find it's because the monitor doesn't support the linear region in the sRGB gamma curve but applies a gamma of 2.2 across the whole range, from black to white.  If I view a black & white image in AdobeRGB and then switch the monitor to sRGB (without changing my monitor profile) I'd expect the shadows to lighten, but they stay the same.  In other words, the monitor is using the same 2.2 gamma curve for sRGB as it uses for AdobeRGB (AdobeRGB gamma doesn't have a linear section).  This means when I switch to sRGB mode and apply the sRGB profile, the shadows become too dark.

It's the same if I calibrate the monitor to sRGB primaries with Palette Master Element.  The gamma is applied across the whole range.  There is no option available for the linear section.

Is this normal behaviour for monitors?  I might expect it of budget consumer models but the SW2700PT is supposed to be aimed at the premium consumer market, even edging into professional.  I notice it's the same on my old Dell U2410 monitors, which were also higher end models in their day.

When I view in sRGB mode, is there an alternative sRGB profile I should be using, without the linear section?  Up until now I've simply been using sRGB IEC61966-2.1.

[richardj21724418]

thedigitaldog  wrote

richardj21724418   wrote

To verify this I calibrated the computer to the (calibrated) display using i1Profiler.  This uses the same hardware and is based on similar software to PME, so you'd expect similar results...

No, it absolutely isn't.

Well, I know it uses the same hardware so I assume you mean the PME software isn't similar.  Then I stand corrected.  I thought I'd read somewhere that PME used a SDK from x-rite, but I may be wrong or it's completely different x-rite software.

Then I'm impressed the results are so similar.  I know they should be, but....!

[TheDigitalDog]

richardj21724418  wrote

thedigitaldog   wrote

richardj21724418    wrote

To verify this I calibrated the computer to the (calibrated) display using i1Profiler.  This uses the same hardware and is based on similar software to PME, so you'd expect similar results...

No, it absolutely isn't.

Well, I know it uses the same hardware so I assume you mean the PME software isn't similar.  Then I stand corrected.  I thought I'd read somewhere that PME used a SDK from x-rite, but I may be wrong or it's completely different x-rite software.

Then I'm impressed the results are so similar.  I know they should be, but....!

Hardware (colorimeter) yes, software and where the calibration takes place, not at all. But this is getting pointless. The correct answer was provided.