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SilentCaay
For downscaling you just resize and/or crop. For upscaling, you need a bit more talent. If you're upscaling by only 100 pixels or so then you can resize it and tweak the sharpness a little. If you're upscaling more than 100 pixels this will make your image look like crap.
If the image is simple enough you can learn to vector trace. With a vector you can upscaling it as big as you want but it only works well with simple images. Otherwise your only option is to ask for a source and hope that you 800x600s were downscaled from a larger image that someone has.
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