Emulator

Internal Resolution settings of whole multiples should fix this. Are you using a whole multiple IR setting (e.g. 1x, 2x, 3x)?

I'm using the auto setting, so it should be an even multiple.

Issue seems to occur with any "Internal Resolution" setting higher than 1x.

This happens on a lot of games, I'm not sure it's a bug with Dolphin though, simply an effect of raising the internal resolution to something it's not meant to be.

I checked it out. The PAL version doesn't care what internal resolution you run at, while the U.S. version does. Could it be some kind of rounding error in Dolphin?

Still exists on 4-2741.

Umm, I see some defects at 1x IR in latest master? Can someone confirm this; look just above the spike pit in the first area.

So, yes, in 4.0-5823 I see a defect above the spike pit in the first screen. A light gray line that seems like it shouldn't be there.

I tried to reference some let's plays off of YouTube, many of which seem to show the same defect. Unfortunately it's not clear which may be using Dolphin to play, I'm guessing most of them are. There is at least this this one...
https://www.youtube.com/watch?list=PLTrGf4JA0WlPC8RWo813ujTwcuOU5pMCq&v=6XRcow7xn2E&feature=player_detailpage#t=68
...which doesn't appear to be using Dolphin and also doesn't show the defect.

Adding that I think this same issue may effect Muramasa: The Demon Blade, though I think I've only tested the NA version.

Other effected titles:
Hollywood Squares
The Price Is Right 2010 Edition
Press Your Luck 2010 Edition

https://wiki.dolphin-emu.org/index.php?title=File:Hoywood_Squares_Seams_1x.png
https://wiki.dolphin-emu.org/index.php?title=File:Press_Your_Luck_Buttons_x1.png

https://wiki.dolphin-emu.org/index.php?title=File:Muramasa_Tiling_Problems.jpg
https://wiki.dolphin-emu.org/index.php?title=File:RSFE7U-1.jp.jpg
https://wiki.dolphin-emu.org/index.php?title=File:RSFE7U-3p.jpg
https://wiki.dolphin-emu.org/index.php?title=File:RSFE7U-4p.jpg

kolano wrote:

Other effected titles:
Hollywood Squares
The Price Is Right 2010 Edition
Press Your Luck 2010 Edition

Yes this was also captured in #10401 , it seems like a bug in texture uvs being off? In addition to all those titles mentioned, I wonder if this is the cause for De Blob as well?

Super Swing Golf: https://wiki.dolphin-emu.org/index.php?title=File:Super_Swing_Golf-Dialog_boxes_issue.jpg

Also:
Sexy Poker

Seems this effects some GameCube titles as well. It seems to be occuring in Sonic Adventure 2 Battle.

I question this being invalid. There is clear screen capture evidence of it being present. Though it's been claimed the Blaster Master tile edges are visible on the console, these issues effect a wide array of other titles too, particularly if >1x IR is used.

Hollywood Squares
Muramasa: The Demon Blade
Press Your Luck 2010 Edition
The Price Is Right 2010 Edition
Super Swing Golf

...likely numerous others where screenshots have not been captured

It's been some time, and as I'm still experimenting with texture pack development for this game, I'm challenging the status of this issue being invalid as well, as the game has no issues with texture seams in the original and when using the original textures at > 1xIR.

I'm not saying it's a bug, because as people have put it it's a normal thing that happens when you upscale the original texture, but I'm hoping there's at least some devs looking into a workaround to help mitigate its effect. I know it's not caused by poor texture preparation, because I've tried upscaling the original textures 4x using nearest neighbour, and the seams are still there.

Higher resolutions can uncover pixel inaccuracy issues.

Unless we want to fill the emulator with pixel offset hacks, this isn't going to get fixed. We already have one.