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8ft x 4ft poster...but how many dots per inch for images?

Community Beginner ,
Jun 15, 2009 Jun 15, 2009

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I've read a online somewhere a while back that the bigger the end product, the less the amount of dots per inch needed. is this true? if so, when do I start changing from 300dpi for A3 sizes to smaller DPI's on larger size prints?

is there a way to calculate this? I'm always thinking it might for spending less ink on the larger size prints, etc

and what should I use for a 8x4ft poster when:

1. people are gonna see it up close

2. when the closest they get would be about 4-5 feet away

with this particular poster, people are gonna be up close.

thanks for any info

[Posted June 2009 and now locked. Please start a new thread.]

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correct answers 1 Correct answer

Deleted User
Jun 15, 2009 Jun 15, 2009

Talk to the company who will make the final print. They will tell you what is best for their equipment. I use a company that makes display booths for conventions and such. They use 100ppi. the images look great even up close.

Always talk to the printer.

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Community Expert ,
Jun 16, 2009 Jun 16, 2009

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This might not even be taking into account they are actually printing it as a halftone.

I'd really like to see the poster to see what way it will be screen printed?

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Community Expert ,
Jun 16, 2009 Jun 16, 2009

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(working in inches)

1/((distance x 0.000291) / 2) = ppi

Seen as you're viewing from 4 feet away (48 inches)

You need

1/((48 x 0.000291) / 2) = 143 ppi for final size

Do I get to wear my glasses?

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Community Expert ,
Jun 16, 2009 Jun 16, 2009

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Yes - but you have to stand at least one extra foot away.

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