Large print - quality issue

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Hello,

I have a question regarding print quality;

I'm working on a project for a gallery (here in the UK) which involves producing composite images. The composites are made from images of school kids photographed against a plain backdrop, which are then cut out (in photoshop) and placed into a 'scene', to form a series of tableaux.

All the images (backgrounds and school kids) are shot in RAW on my Nikon D700. The gallery want to print the final composite images at a size of 1600mm on their longest edge, so we have taken a couple of A3 cropped sections from an image which I sized at those dimensions to see how they will look.

The main problem is that there is (obviously, I guess) a disparity between the background 'scene' image, and the 'composite element' images (the cut out school kids) in terms of image quality...the school kids look OK but the background scene image looks grainy. Whilst the final images were always meant to be presented as composite tableaux (it was never intended that they look like 'real life' scenes) the difference in the image quality (between image components and background) seems too great. Obviously I understand that the background scene is being blown up way bigger than each cut-out element of the image, and so is bound to look more grainy, but wondered if there was a way to print a RAW file at that size without so much loss of quality...? How big can a RAW file go before it starts to break up? I've been told that I should be able to print a Billboard sized image from a RAW file, but I suspect that is a different kind of printing technology to that of printing a digital photograph... If I can print the background image without too much loss of quality then the composite elements will sit better within the scene...at the moment they stand out a mile because they are very clear/non-grainy by comparison.

Any advice on this gratefully received.

Cheers,
Jonathan.

--
Jonathan Turner - Photographer M; 07796 470573 W; www.jonathan-turner.com

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