I am reading some very interesting discussion in this thread regarding what are the most important aspects that make a good video image.
Here's my two cents.. According to not only the Imaging Science Foundation (ISF), but also THX; both of whom drive industry standards and train professional video calibrators worldwide, resolution is not the most important factor influencing video performance and hence good picture quality.
In fact, it’s quite a way down the list of importance. According to both ISF and THX, the least of the key parameters is resolution; the single most apparent thing you see is dynamic range; contrast and black level are most important; of next importance is colour saturation, depth, subsampling, and accuracy; and resolution is less important as compared with all of these. Furthermore, personally I'd also consider peak luminance, gamma performance, motion handling, and uniformity to be of at least equal importance too.
Specifically, ISF president and founder, Joel Silver reports that “the fourth and least of the four key parameters is resolution;”
and “the single most apparent thing you see is dynamic range.”
Similarly, Gregg Loewen, who heads the THX professional video calibration trainings worldwide, says “contrast and black level are most important”
and that “resolution is only fourth behind contrast, colour saturation and colour accuracy”.
That said, of course personal preference will play a role here, in that for some people contrast and black levels might be of lesser importance than others, whom might consider resolution to be higher up on the list of importance; but I think it's fair to say that there are a several aspects, the summation of which influences how good or bad is the perceived overall video image quality.
With respect to image contrast and black level, I also consider that it's not just the native contrast performance, but also both the ANSI contrast performance and the dynamic contrast functionality that are also important.
For example, I am currently in process of completing a comprehensive in-depth review and evaluation report with respect to a brand new home cinema/theater projector, which uniquely sports all of:
• High ON/OFF contrast (circa 30,000:1 at typical light output levels; so about on par with the JVC laser projectors)
• The highest ever ANSI contrast (900:1 - 1,000:1; which is circa 3-5 times greater than the JVC and SONY projectors)
• Perfect dynamic dimming/contrast functionality (entirely devoid of pumping or artefacts)
• The combination of which equates to a ‘Triple-Whammy’ resulting in the best contrast and perceived black level performance of any home theater/cinema projector currently available in the world.
• 7,000 lumens (approx.) peak luminance calibrated
• Up to 107% coverage of DCI-P3 and 85% of BT.2020 color gamuts
• True 10-bit color processing
• Perfect focus and image uniformity
• Small footprint
• Low operating noise levels
Whilst I appreciate that screenshots are frowned upon by many folks on here (with good reason); because, typically, photos taken of projected images by people are almost always inaccurate and/or by no means truly representative of what is the actual appearance of the projected image. Furthermore, in many instances video editing is subsequently applied, yet even further altering their appearance. Consequently, in all such instances the photos / screenshots are of little use in evaluating what is the actual performance of the particular projector. However, in this instance all the following photos / screenshots are in fact very accurately representative of what the corresponding projected images actually look like. This is because they are raw images, which have been photographed professionally. (N.B. in order to view the images with the best accuracy this is best done via a calibrated video display, TV, or monitor.)
The ANSI Contrast performance in particular is completely insane. When I first saw a projected ANSI checkerboard pattern my jaw hit the floor because it was/is quite literally a perfect WHITE, BLACK, WHITE, BLACK. In fact, here’s an accurate photo of the projected ANSI Contrast Test Pattern; wherein, you can see this for yourself:
And here's some accurate screenshots... note the contrast, black levels, dynamic range, and color performance:
And here's why the colour performance is so good, this being the measured DCI-P3 color gamut coverage capability:
It's the first instance of a projected image that I've seen wherein blacks actually look truly black. It outperforms the infamous Christie Dolby Vision projector in more ways than one; and the characteristics of the projected image has more in common with an OLED TV than the typical projector.
My point being that with respect to this particular new projector it's actually all the other aspects further to image resolution
that in combination the summation of which produces truly exceptional projected video image performance. So this is an example of where the image resolution is in fact the least important factor.