Tariq Gibran Offline Upload & Sell: Off
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There are a lot of variables. Some of the more important ones are monitor pixel pitch/ resolution, interpolation quality, input resolution for print size and, of course, paper type/ printer.
So, the 50% does not apply if, for instance, you are viewing the image on a Retina Macbook Pro screen (or other similar, high density display that is about twice the resolution of traditional screens). On these screens, it's more like 100% view at printed size (and resolution) is a better indication. For larger sizes, you should interpolate the image up first to print size and resolution and then use the 50% or 100% (per above) to soft proof. All of this assumes you would be printing on glossy, luster or a very smooth matte that will show fine detail. Canvas and watercolor paper with a heavy texture will not show as much detail and will not require as much scrutiny. At larger sizes with Epson or Canon Inkjet, I usually judge larger prints at 240ppi at print size on screen using 50% with traditional density screens (iMac 27", NEC 27" and so forth).
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