For low contrast pixel transitions like say a grey pixel with a slightly brighter grey pixel below it, flicker should be less as the difference in brightness is smaller. Say you have a white pixel directly below a black pixel, the white pixel would flash on and off at 30hz since it's only drawn every second field in 480i mode. I think Maeson's description is correct - the vfilter was originally intended for when Wii is outputting 480i to CRTs to prevent high contrast pixel edges from flickering at half the refresh rate (30hz). I'll try and keep an eye on that from now on.
Dolphin emulator vertical lines 480p#
So basically all what this does is to remove a blurring filter that was forced on purpose for 480i, but also was present on 480p where it not only shouldn't be needed, it actually worsens the for the late reply - missed the notifications in my email. It's not encouraged to turn off the filter on 480i without a way to soften the flickering. The filter should always be turned off for 480p, and also for 480i IF your display already does apply a filter on its own (and it's not an option usually, it just forces it). First party Nintendo games usually have the most subdued (yet still noticeable) while the vast majority of third party games use the strongest one (which looks to be the default option when creating a Wii project?). I have no idea with other systems, but GC and specially Wii have different "levels" for this filter, and different games use different intensities. I don't know for GC (I guess it was generalised as Progressive wasn't a feature on a "Bios" level and it was depending on the game), but Nooblet Cheese found that on Wii, keeping the filter on 480p was intentional, which I personally find to be a big mistake. Only select few titles had options to remove them, such as Sonic Heroes on GC or Smash Bros. It is entirely unnecessary, as Progressive resolutions refresh the entire screen at the same time, thus it has no flickering effect. While for 480i can be beneficial depending on the display, these filters STAY TURNED ON while on Progressive Scan, both on GameCube and Wii.
Dolphin emulator vertical lines ps2#
On the other hand, LCD screens often have an "interlaced" filter of their own, so the picture could get double-filtered and make it even more blurrier (and with PS2 not being filtered generally, it depended on the TV).
This was specially benefitial with CRTs, which, as far as I know had little to no protection against the Interlaced refresh, so them being on the systems themselves was helpful.
They blur the picture in an attempt to make the refresh rate a lot more subdued, at the cost of making the entire picture blurry. This shake-y effect, besides being able to strain your eyes, was also though to cause epileptic attacks. This creates a shaky effect on the image, which, depending on your display, can be more or less noticeable, with the colors present on the screen (very easy to see with white over black) and the type of display being factors to make it even more annoying to look at.
On Interlaced resolutions, only half of the vertical lines gets updated each time, alternating continuously. This filter (and others like this for systems such as the Dreamcast, GameCube, Xbox and some PS2 games) was used to prevent the flickering image refresh that Interlaced resolutions had. If I remember correctly, the thing is this:
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