For my best/dark room 1080p calibration, I used sRGB mode (normal lamp). I used sRGB mode rather than Movie because it’s color gamut was slightly better. Like so many other projectors I have calibrated the S718QL clips the whites ever so slightly (230 or so) and lowering contrast does nothing to help this matter. There is only one set of white balance (gain) adjustments and no gamma controls. So, although I would have preferred a gamma of 2.4, I set my target to 2.2 based on the projectors performance and was able to get an average of 2.14. The S718QL before white balance/gamma DeltaE ranged from 3.5 on the low end to 11 on the high end. After calibration I was able to get it to 2 or less across the board (10-100IRE). DeltaE of 3 or below is considered excellent. White balance averaged around 6400K.
I wanted to set contrast 2 clicks lower from its default of 50 because it helped my gamma and white balance a small amount at the 90 and 100IRE range. I did not however because by making any changes to contrast, brightness, color or tint would toss me out of sRGB mode and into custom mode. Now other projectors have done this before by coping your settings from your chosen mode, in this case sRGB and applying them to custom mode. Problem here is that is does not do this, it just places you in custom with its far from desirable picture performance. So, in order to stay in sRGB mode I can’t touch any picture controls except for white balance.
The S718QL has no CMS controls. You have to live with what it gives you, which is why I choose sRGB because it displays the best color gamut of all the picture modes. Now if you look at my color gamut charts (below) you will see there are slight differences between before and after. You may ask with no CMS controls why aren’t they the same? Well the white balance gain calibration I did has an effect on color gamut. Over all the gamut is not terrible but it’s far from great too. Blue and yellow fair the best. Magenta is over saturated at 100%. Red is under saturated across it’s range. Green is under saturated across its range except for 100% which is over saturated. Oddly the hue of cyan got worse after calibration with it now running towards green.
Delta E is a metric for understanding how the human eye perceives color difference. The term delta comes from mathematics, meaning change in a variable or function. The suffix E references the German word Empfindung, which broadly means sensation. Simply put, look at Delta E as a measure of grayscale/color accuracy. 3 and under is considered ‘Excellent’ and imperceptible by the human eye.