08 August 2002, 08:57 PM
poster sizes are generally worked out in 'a' sizes eg
A4 - 210mm x 297mm
A3 - 297mm x 420mm
A2 - 420mm x 594mm
A1 - 594mm x 840mm
see the pattern? Each size up is twice the size of the previous one (it works the other way too a5, a6 etc)
In terms of resolution (in DPI - dots per inch), it depends on your printers, it should be around twice the screen frequency (in LPI - lines per inch). So contact your printer and ask what the screen frequency for an offset printed 4 colour poster would be. If he says something like '155 lpi' your image should be 300DPI ish.
So if your image is say A1, thats 23.3 x 33 inches, so your render should be then 7015 pixels x 9928 pixels.
If you are going to a large format digital printer (kind of like a big inkjet) you dont need to worry about screen frequency, just find out the resolution of his printer.
When you send out files, unless there are layers in your photoshop file that require colour correction. You might be better sending a single layer format that is more compatable, like a TIFF file. You can also use LZW compression on it to bring down the file size & make transportation easier... :)
08 August 2002, 07:00 AM
Ahh.. thanks! --- That 7015 pixels x 9928 number was exactly what I was looking for! :)
01 January 2006, 02:00 PM
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