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1) "Gray scale or the brightness of the sub-pixel color is determined with a 8-bit gray scale signal for each dot,
thus, presenting a palette of more than 16,7M colors with A-FRC(Advanced Frame Rate Control)."
I.e. it takes a 8 bit input. It applies A-FRC to "emulate" further colors in excess of 16,7M.
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They say it's not a massive issue because they saw no adverse effects, but it's a serious issue for Mac users because Mac OS X also enables dithering through the video card, which causes the two dithering patterns to clash and produce significant artifacts. That's how I know for sure which monitors dither and which ones don't.
3 out of 4 shades would have to be dithered for 6-bit color to emulate 8-bit color.Whoisthisreally said:Do FRC monitors typically dither on all grey shades or a small subset of the 255?
It's definitely dithering through the GPU, also confirmed here: http://tech.groups.yahoo.com/group/psychtoolbox/message/10369brumwald said:To me it feels like it'd rather be something like conditioning or something, dither on the graphic card just seems utterly ineffective.
And why would they? I thought all 6 bit panels used dithering, so how is dithering through the graphic card supposed to help with anything? To get >8bit precision?
Whoa! Thanks a lot for this link! It's finally solved dithering on my F2380 in Mac OS X3 out of 4 shades would have to be dithered for 6-bit color to emulate 8-bit color.
It's definitely dithering through the GPU, also confirmed here: http://tech.groups.yahoo.com/group/psychtoolbox/message/10369
They seem to think the problem only affects NVIDIA GPUs in Mac OS X, but I know for sure that dithering is also enabled for ATI GPUs.
They also have a workaround to turn off dithering on NVIDIA GPUs, which people have used for the Dell U2311H and U2211H to work around the pinstriping problem caused by the two dithering patterns clashing with each other. Unfortunately, I don't know of a workaround for ATI GPUs, which makes the Samsung c-PVA monitors unusable on ATI-based Macs. I don't know how the Dell monitors perform with ATI-based Macs.
As for why they would do that, I'm not sure, but the dithering allows the video card LUT to be calibrated in Mac OS X without significant banding, so that might be one reason. Apple displays and laptops don't have any color controls, so everything has to be done through the video card.
You're indicating that it is a native 262,144 color panel with FRC to achieve more than 16.7M colors (probably 16,777,216).@ tk-don: an 8 bit palette yields 16777216 colors. That is “more than 16.7M colors”, however you cannot say that it can display 16.8M colors since it lacks 22784 colors for that. Saying it can “present a palette of less than 16.8M colors with A-FRC” just sounds crap.
We should add that using FRC is nothing new (and is also used in the very few displays with a real 10bit panel (e.g. the LG W2420R); at least when feeding a 8bit signal). All better displays with extensive electronic have used it for many years (as implementation in the scaler) to avoid a loss of tonal values after high bit processing of the signal. LG has started a quite new trend (apart from implementations in TN-panels) in the last years when implementing a FRC stage in the panel itself. However: "Pseudo 10bit" or 8bit panel with previous FRC implementation makes no difference for the user (while it has some impact on the electronic): Good FRC only leads to (from my point of view) minor drawbacks without annoying spatial artifacts at least for the 10bit(12bit)/8bit conversion while feeding a 8bit signal. You will see some sort of temporal noise when looking very close to the display.The Dell U2311H, on the other hand, shows evidence of dithering, so that one might be 6-bit. The U2311H also glows orange/purple while the EA231WMi glows white, so that tells me they are different panel models, although based on the same panel. As for the Dell 2209WA, that is true 8-bit as they have indicated.
I had a dell S2340L ips, i was very happy with the colours, and saturantion, everything went great until i played games that could not keep the 60 fps and when it touched 24-30 fps i did get very masive ghosting, it's like the caracter almost dubled again and the enviroment, this could be because the FRC?