I recently won a prize draw for the Brighton Photo Biennial, part of which is a 42-inch print of one of my photos printed by Martin Parr's printer.* I collect it this Saturday, when I'm given a tour of the print studio.
[* The rest of the prize is a signed Martin Parr photobook, an invite to all the private views, and to the private party afterwards (with Martin Parr and Alec Soth), and being put on the guest list for free entry to all Biennial events this weekend!
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I chose an M8 photo to print (below) - I'll let you know how it looks!
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Usually, I print on A3+ size paper (about 18 inches, for those using antique measurements!) for exhibitions, and Leica M8 files are fine at the size. However, prints much larger than that need interpolation - my agency requires 50 MB TIFF files (~18 MP), which M8 files can just about handle: there's minor softening and artefacts when viewed at 100% on screen, but these won't be visible when printed. My agency is happy with interpolated M8 files, but has rejected some interpolated Canon 5D images on technical grounds (the 5D has 12 MP) - I guess when you're almost doubling the image size, the M8's better resolution because of its lack of an anti-aliasing filter just tips the balance...
If anyone's interested in seeing 100% crops of straight and interpolated M8 images, see this post of mine:
http://www.rangefinderforum.com/forums/showpost.php?p=1074925&postcount=34 Yes, there is some minor - but acceptable - artefacting, but bear in mind that this is at screen resolution (about 96 ppi), whereas prints are typically 180-300 dpi, so the interpolated image will end up as a print half to a third the on-screen size.
Incidentally, the 50 MB TIFF requirement hasn't been plucked from thin air, but is based on requirements for ideal reproduction of photographs by the publishing industry. As mentioned, 50 MB approximates 18 MP, and this allows someone with perfect 20:20 vision looking at the printed image to perceive it as perfectly sharp, regardless of the printed size (from a book up to a huge billboard poster), providing the person is standing at a normal viewing distance (which will increase the larger the print - no one looks at a poster from 15 cm!). More info on this topic here:
http://www.l-camera-forum.com/leica...30720-m9-faq-sticky-thread-2.html#post1415787 (By the way, I've worked in publishing for decades, so I knew all about this well before digital cameras came out, as I had to process scans.)
Deaths Head Hawkmoth