In another recent thread, I was speculating about an upgrade to the K-r from my K-x, since the K-r has a 921,000 "dot" screen, pretty much equal to the number of pixels in 720p video (1280x720=921,600), while the K-x only has a 230,000 "dot" screen. I find that it's difficult to judge perfect focus on my K-x while shooting video, so I thought that the K-r would be much better in this regard since it is able to display all, or nearly all, of the resolution of 720p video.
But then a helpful user came along and burst my bubble by informing me that the "dots" listed in the specifications includes each of the red, green, and blue pixel elements. So the true resolution would be 1/3 of 921,000, or only 307,000 pixels. And this means that the true resolution of the K-x is actually only 76,666 pixels (230,000 / 3). So while the resolution on the K-r/K-5 is definitely a huge upgrade from the K-x, it's still nowhere near the 921,600 pixels of 720p video.
I don't usually think of video resolution in terms of numbers of pixels, but rather, in terms of vertical lines x horizontal lines. For example, 1920x1080 or 1280x720. I sent an email to Pentax technical support asking for the horizontal x vertical resolution of the LCD screens on the K-x and K-r/K-5 to make it easier for me to compare that particular feature.
Here's is the response I got back from Pentax a couple days later (emphasis added):
Hello:
On the K-r, as you can with the K-x, you can zoom in on the subject when using the camera in live view and as in movie mode the camera is always in live view also in movie mode by pressing the Info button.
When the focus is set to Auto Focus the magnification is 1x, 2x, 4x,6x then back to 1x as you press the Info button. When in Manual Focus the magnification is 1x, 2x, 4x, 6x, 8x,10x then back to 1x.
This allows the focus to be checked easily. On the K-r/K-5 the LCD is noticeably sharper than the K-x LCD both at 1x and up to 10x.
The description of LCD screen resolution is always given as the total number of dots on the LCD. This is the same for all manufacturers. We do not publish the horizontal or vertical resolution of the screen, again like the other manufacturers.
Best regards
CSR2
The Pentax CSR Team
So while I certainly appreciate the response, and the attempt to help me out by pointing out the zoom feature, I find it humorous that the true resolution of the LCD screens is supposed to be some kind of secret. And the reason given for all the shenanigans, is that "everybody else is doing it". That excuse certainly never worked with my parents, so it would be nice if Pentax (or somebody) would stand up and start publishing the honest figure. Even if it was just in parenthesis after the super-duper-marketing-figure. For example 921,000 dot screen!!! (640x480x3). Maybe eventually, other manufacturers would start to follow suit and the silliness could end.
I know that pretty much all of the camera manufacturer's play this game, but it's rather absurd. As if people are going to be impressed by an artificially inflated (and confusing) screen resolution, and then decide to buy a camera that they would otherwise not have bought. And when all of the manufacturers are playing the same game, then nobody is really gaining an advantage anyway.
It kind of reminds me of the bad 'ol days when a 15" computer monitor was actually a 13-some-inch monitor, because the manufacturers all absurdly included the area of screen glass that was not even view-able. Who knows how that practice started, but I don't think it went away until the age of LCD monitors.
Anyway, here's the true vertical x horizontal resolution according to forum user "drougge" (Thanks drougge, and I've rep'd you!)
K-r: 640x480x3 = 921k
K-x: 320x240x3 = 230k
Just please use caution when sharing this extremely sensitive information...we wouldn't want it falling into the wrong hands.