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We have been contacted to shoot images for a 10X35 feet mural at an airport. We have Canon 1dsMk2 (16MP) equipment. We have uprezed images to wallpaper size, sending 600MB-1GB images (JPEGS) and they look pretty good from about 5 feet or further. We did not do the actual production, but I think we based our uprez size on about 100 dpi max. Do we have enough MP to do this, or should we rent a back for more resolution? Oddly enough, the client says they need 300dpi at that size, which translates to 26GB, a totally unrealistic size and indicates to me that they are not really aware of what they need or are doing.
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First you are correct that the client’s expectation of 300 dpi across the entire 35-foot width is unreasonable, unless the artwork is comprised of quite a large number of smaller photos, which I doubt it is. As for what DPI is “good enough” at full-size for a mural, I think your 100 dpi target is a great goal, and 99.5% of spectators who walk past such a mural will not notice or comment on any issues relating to pixelation. We have to remember in this business, that the huge majority of customers and visitors for whom these “grand format” (ultra-large) murals are intended are going to see the CONTENT (message) not the presentation, unless the presentation is so sub-par as to distract. For most photo subjects and mural applications, a 16-megapixel camera with a fractal upsample will produce a satisfactory mural at 35 feet wide, provided you’re not horizontally cropping the image to any degree. The bottom line is that since the question of “adequate resolution” is entirely subjective to (a) the levels of contrast and detail in the artwork; (b) viewing distance and angle; (c) passing speed of the audience; and (d) the client’s own fussiness; the best way to take care of your client and yourself is to explain these environmental influences, and also to disclaim in your contract any baselines for “apparent” resolution.
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What’s the largest size Duratrans backlit graphic that Blue River Digital can produce?
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We have 2 Duratrans processes. The small-format Duratrans can be imaged up to 50” wide x 20 ft. long, seamless. The “jumbo” Duratrans has a maximum seamless sheet size of 72” x 146” (6 ft. x 12 ft. 2 in.). For backlit sizes larger than these, we can splice your Duratrans graphics together, although this may result in a visible shadow line at the seam.
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