Analog TV no distortion


Analog TV low distortion


Analog TV high distortion

Light Sepia


Golden Tinttion


Faded


Black & White


Saturated Warm


Pastel Warm


Aged Tint


CRT Monitor


High Contrast Golden Tinttion

Honestly I don't know. I asked this question back in 2015 in the discussion board but never got an answer. Now in general artistic terms 'pixel perfect' refers to a conscious placement of every pixel, without interpolation and stuff like that, which happens e.g. through anti-aliasing.

So my guess, and I don't even have the game installed right now, would be that it relates to up-scaling to your screen. I think the base game has a resolution of 960x540 (half of HD), think of this as 1:1 (on most modern screens this would mean playing in a window). Now you want to play the game in fullscreen on your 1920x1080 full HD monitor. No problem, the game is simply displayed in 2:1 for both axes, making everything twice as big, while still keeping the proportions (so, it's still "pixel perfect").

Now what happens when you have a slightly odd display size (e.g. on a laptop or a multi-desktop setup), let's just assume a resolution of 2560x1600. You might have noticed that the aspect ratio is different, that is we can't simply take the same scaling factor for both axis (2560/960 = 2.667, 1600/540=2.963). Soo... what to do know?

Basically there are two options now:
a) Go for true full screen, scale the one axis by 2.667 and the other by 2.963. This will fill your whole screen, but will also slightly change the proportions of everything (in this case our green pixel guy would look slightly rectangular instead of a perfect square, because his width has to be stretched out over more display area).

b) Stay true to the original aspect ratio and scale everything by the smaller of the two axis factors. In this case we would scale everything up by 2.667. This means that the height is completely filled, while the width will have black borders at either side. In contrast to option a) this will keep the proportions of our pixel guy intact, leaving him as a perfect square (or a 'perfect pixel').

Now if you only have a HD monitor or a monitor with the same aspect ratio of the base game, then you wouldn't notice a different when the 'pixel perfect' box is ticket or not, simply because there is no space to fill with black borders.

Hope this helps :Pixel: