Oh ok. I thought you took snapshots of it in MAME. That's why I thought you shrunk it.
I just realized I could do that. I remember I tried doing that with arcade flyers when I cropped out the cabinets on the flyer and I tried to remove the remaining background on the edges of the cabinet image. But when I did that, the "fill with color" tool only barely worked because the image was not pixelated like images of video game gameplay.
You can use the "Fill With Color" tool in paint to just fill/remove the same color in one batch.
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