For photographs, 180 dpi is often sufficient for large prints. For 
diagrams, which are less complex, you might even get by with less, maybe 
even 120 dpi. You could try rendering a portion of your image at that 
resolution (e.g. 540 x 540 for a 3" square) and see how it holds up at a 
normal viewing distance.

Cheers.

rgb wrote:
> Large format prints are not usually printed at the same resolution as 
> normally-sized images. This compensates for the distance the viewer is 
> at to see the image. If a professional printer is doing the work ask 
> them what resolution they need.
>
> Rich
>
> Eva Vanamee wrote:
>   
>> Hi,
>>
>> I'd like to save an image in high resolution for a poster.
>> The requested size is 20" by 30". I calculated that it would correspond 
>> to a 6000 x 9000 pixel image.
>> How can I create such a large ray traced image without crashing the 
>> computer?
>> Many thanks in advance for the help.
>>
>>   
>>     
>
>
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