a very large image

[roodkapje]

I have a question about creating large images.
I want to make a image 4.5 meters by 2.5 meters.
On it will be a photo.
I can make a new document this size 80dpi without the image and it will be a very very large size document.
Then my scanner can scan up to 800%, but for a average photo this will bring it up to just a small portion of what I actually need.
How do they create images the size of mega posters?
Do I create my document via quark or how?
Thanks so much

 

[MarcusStringer]

I think (someone else would answer you better, but) they make the DPI smaller, ie down to about 72DPI because at that size you will be standing a long way from it, thus making it look ok.

There are also programs (called Spline) which will enlarge upto 1000% etc.

But I think it's more like the first one because the file size on the second one would be huge...

Marcus

http://www.midlandtypesetters.com.au

 

[blueark]

Quark is limited to 48"x48", so you normally work to a smaller size and get the printer to enlarge. In your case, probably working at 25% will suffice (ie 1,125 x 625mm) and tell the printer to enlarge 400%.

Of course, that means the resolution has to be 4 times higher, so 80 dpi becomes 320 dpi.

I don't use the zoom facility on my scanner, for the reasons you pointed out. Instead, scan at 100% but again, with a higher resolution. Here's a sample scenario:

Your photo is 225 x 150mm, for example. The final size is 4500 x 2500mm. Take each measurement in turn and divide the smaller into the larger. 4500 / 225 = 20. 2500 / 150 = 16.67. Take the larger figure (20) and multiply the final dpi (80) by that. 80 x 20 = 1600. Scan your photo at 1600dpi. If it can't manage that, zoom 200% and scan at 800dpi, etc.

Finally, don't be too worried about accuracy. Large format printing can be very forgiving.