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Collember
05-29-2006, 12:15 AM
Here at our work, we do signage, and at times that means using VERY LARGE tiffs to print interior signage that is upto 8m long and is viewed from around 1m away - so needs great quality.

We get these images to produce for a certain bank. The files are about 1.5gb, and at 100% are 1200 to 1500mm wide....so for what they are, are quite large. But since we go upto 8m - so far, obviously resizing up from this point will mean a loss in quality.

However, the problem lies in the original image, i dont know much about professional photography, and in that, RAW. But i have a few samples of the quality problems we have, and would like to know how they come about, what causes it, what was done to make it appear.

By what i see, i think it looks like a sharpening filter, scanned film (which was fixed up), miss focus, i dont know.

To know what is going on wont necessarily make the quality any better than what we have, but might help us notify our client's suppliers....of what we need
jetjaguar
05-29-2006, 04:59 PM
The examples you'v shown look like the unsharpen mask filter. Although my suggestion for enlarging your images; would be convert them to custom shapes or smart images.
tfritzsche
05-30-2006, 04:09 PM
Hi Collember,
The images look like the original was a "painted" piece, as apposed to a photograph. In any case, the images show sharpening artifacts, jpeging, possible blurring ( possibly to "fix" some of the artifacts). To Fix these images would require drawing in detail and removing a lot of the artifacts and possibly putting in some noise to replicate film (people are still more accusted to seeing grainy pictures the pixelated/jpeged images, grainy still looks more "right"), but this is a lot of work.
I think you 1m viewing distance for an 8m poster is a tad close, I would say the viewing distance of the poster would be more around 3-4m at the closest, maybe they can get closer, but at that distance it is like pressing your nose up to an 8x10.
For the size output you are dealing with you will need 4x5 or 8X10 traditional film quality, in the digital camera world this would mean doing multiple shots and stiching them (ie 2 x 22+ megapixel captures)at the very least. Scanning in film you would obviously use 4x5 or 8x10 film and scan as large as optically possible, prefferably drum scanning on a highend scanner. Smaller film sizes would give you too much grain.
I hope this was helpfull
thomas
Collember
05-31-2006, 12:19 AM
the image can be viewed from upto 10m away, however, its going against a wall and ppl will be walking past it, hence only 1m away or so - even closer.

Its not a painting, or a scanned photo. Its the origianl photo it seems. it just looks horrific. Im well aware of the work involved in "fixing" it, but at 8m of graphic....its just impossilbe to do in any time frame.

Im more after what we can say in terms of to the customer what kind of graphic should be supplied, there-in what sort of photography.

thx for the input tho :)
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