The least acceptable resolution is usually around 150 dpi, any less and it doesn't look to hot...so that's around 1200*1500 for an 8*10. Make sure to downsample you image properly using something like Photoshop. You probably shouldn't need to go above 600 dpi.
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!