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Oh gosh, please just simply number your test scripts, no one cares about what they call.
For the ringing problem, you'll need to go with some higher end resizer like nnedi3.
And it's pretty clear now that adding a shader on top gives the best visual effect for these retro games. As the main problems with these low resolution images are the pixelated diagonal lines and the lack of texture when upscaled, so you can't blur them because that will turn them into ugly color blocks. The vertical and gird shader looks like the answer here, as they both added fake details to "smooth" out the diagonal lines and added fake "textures" into the color blocks.
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