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Colour/Color problems

Started by mmca Jun 25, 2005 at 12:17 PM 10 replies 1.6k views
Original Post
mmca
mmca
This is a bit of a long shot but wondering whether anyone here has every tried playing a game on a low refresh rate monitor. We bought a flatscreen Philips TV recently and it does something kind of weird. It seems to refresh pixels slowly, as in if something blue moves on the screen, some of the pixels which represented the blue object would still be blue, but faded even though the colour should have been refreshed. This isn't just for games, even when watching tv, some colors stay on screen, that shouldn't be there. My opinion is that the refresh rate is nowhere near the 100Hz that we were promised, and that's why some pixels appear to still be a color, that they were previously but aren't any more. I know this probably makes no sense the way I've discribed it, but if anyone has experienced anything like this before, any info is much appreciated. Thanks Mick.
mmca
mmca
sorry to get all Irish on you but what's interlaced?
Raduprv
Raduprv
Quote:
Illuminating a screen by displaying all odd lines in the frame first and then all even lines. Interlacing uses half frames per second (fields per second) rather than full frames per second.

Interlacing was developed for TV broadcasting because the allotted bandwidth for each channel; for example, 6MHz for NTSC, was not sufficient to transmit 60 full frames per second. Interlacing with 60 half frames is visually better than 30 non-interlaced full frames. It fools the eye, especially with moving images.

More here
mmca
mmca
checked their website, says it is interlaced. Good read as well, never knew what that was, very informative.

Mick
mattnewport
mattnewport
What kind of TV is it? CRT, LCD, Plasma, or something else? LCDs are particularly known for smearing on fast moving objects due to slow response times - it takes time for the pixels to switch from bright to dark and this results in smearing in many cases. This is one of the reasons why until recently LCD monitors were not recommended for gamers. You can now get LCD monitors with fast enough response times to be good for games but they still come at a price premium.
vNistelrooy
vNistelrooy
Quote:
Original post by mattnewport
What kind of TV is it? CRT, LCD, Plasma, or something else? LCDs are particularly known for smearing on fast moving objects due to slow response times - it takes time for the pixels to switch from bright to dark and this results in smearing in many cases. This is one of the reasons why until recently LCD monitors were not recommended for gamers. You can now get LCD monitors with fast enough response times to be good for games but they still come at a price premium.


Actually the smearing effect is because switching from black to grey takes longer than switching from black to white.
"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"
mattnewport
mattnewport
Quote:
Original post by vNistelrooy
Actually the smearing effect is because switching from black to grey takes longer than switching from black to white.

Whilst it's true that LCDs often have worse grey to grey repsonse times than black to white response times, the smearing effect is just a result of the fact that brightness changes take time. You can see the same things on CRTs if the phosphors take a long time to fade. So the smearing effect isn't because grey to grey may be slower than black to white, that's just an extra detail that makes it harder to characterize whether a given LCD response time is good enough to avoid smearing.
mmca
mmca
It's CRT and that seems to be the feedback I'm getting from other places too. It's not blacks that it has troubles changing, it seems to be blues and reds that leave a trail behind, especially when changing from one primary color to the next.

Edit: although it does seem more evident on bright pictures.
mmca
mmca
I was told when it was brought home that it was CRT, turns out its flat but uses tube. It's 32" but not sure about what the deal is for the problem, I'm gonna check changing colour formats cause can change dip depth I think, cause I seen it changing to true colour when idiot was messing with the controls. Also has 2 scart sockets+leads so going to change their arrangment to see if that changes anything.

Thanks
Mick.

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