The images should not be smaller than a current high end monitor, which is now 2560×1600. This means, not less than 2560 horizontal resolution or 1600 vertical. If you want an aspect ratio of 2×1, for example, this would be at least 3200 horizontally. The reason is that there is quality loss when scaling up but not when scaling down, so pick the largest size display they might be displayed on.
You do not need to antialias the images. When the image is scaled down it shall become antialiased.
What's you opinion on screen resolution?
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