How large can I print a jpg file?

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anull New Member • Posts: 1
How large can I print a jpg file?

I have a tiff black and white photo that seems large enough, 98megapixels, resolution: 7200x4800 at 300dpi. When I save to a jpeg at the highest quality, it drops all the way to 9 megapixels. The print vendor will print either jpeg or tiff, but I hear jpeg generally looks better, and they tend to recommend saving to jpeg to print. My question is, how big can I print this jpeg file?  Does compression factor in?  So if its say 50 megapixels to blow up to a 20x30, then is that for a tiff or a jpeg? Do I need that large of a jpeg somehow? Is zooming in on my monitor to roughly that size good enough to determine?

Thanks

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