dpi for large posters

your post sorta scares me. You should be getting direct guidance from the printer you will be using.

"Stardog" wrote in message

Hello everyone,

I’m in the process of creating a poster which will be about 6 X 8 (feet). The source image is a photo… I’ve never worked in such a larger size before and am a bit confused on how to proceed. Searches on Google yields the suggestion of working in 72 dpi (!?) or 150. Any suggestions for the dpi? (as 300 will be almost impossible to work in.) Should I even do this in Photoshop? Is there any program which scales up an image with smaller decay than pshop?

Thanks!

12" x 16" 300dpi save as Photoshop .pdf on to cd. Most commercial printers should be able to print to required size.

Tam…

It all depends on the distance that it is going to be viewed. If the poster is going to be viewed at a distance you can use a lower DPI than normal.
One thing you have to remember if you do a 6 foot by 8 foot poster at say 300 DPI the file size would be huge and as such you computer might not be able to handle it.

NIK

"Stardog" wrote in message

Hello everyone,

I’m in the process of creating a poster which will be about 6 X 8 (feet). The source image is a photo… I’ve never worked in such a larger size before and am a bit confused on how to proceed. Searches on Google yields the suggestion of working in 72 dpi (!?) or 150. Any suggestions for the dpi? (as 300 will be almost impossible to work in.) Should I even do this in Photoshop? Is there any program which scales up an image with smaller decay than pshop?

Thanks!

"nik" wrote in message

It all depends on the distance that it is going to be viewed. If the poster is going to be viewed at a distance you can use a lower DPI than normal.
One thing you have to remember if you do a 6 foot by 8 foot poster at say 300 DPI the file size would be huge and as such you computer might not be able to handle it.

It’ll be even "huger" if he outputs to CMYK, which will probably be the case.

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Assuming he’s using the same color profile as the print shop…

n8

It all depends on the distance that it is going to be viewed. If the poster is going to be viewed at a distance you can use a lower

DPI

than normal.
One thing you have to remember if you do a 6 foot by 8 foot poster at

say

300 DPI the file size would be huge and as such you computer might not

be

able to handle it.

It’ll be even "huger" if he outputs to CMYK, which will probably be the case.

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"n8 skow" wrote in message

Assuming he’s using the same color profile as the print shop…

Having worked with my share, it’s been my experience that very, very few offest printers even know what a profile is, much less how it is used. Sad, but true.

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If that sounds all wrong to you… relax it is correct!
Lambda poster printers use interpolation to up-scale the image to the appropriete dimensions. If you thought of saving a file the size of your poster at 300 dpi… It wouldn’t fit on a DVD much less a CD. Doug

"Tam" wrote in message

12" x 16" 300dpi save as Photoshop .pdf on to cd. Most commercial printers should be able to print to required size.
Tam…

Some of these printers are 6 color or more… it’s really best to check with the specific printer he intends to use.

I’ve read that it can be better to send the file as RGB, since it will split off into some of these machines with a wider gamut of hues… once they’re thrown out when converting to CMYK, they’re gone forever. Often print drivers are optimized for RGB…

Another idea is to send a small version of the pic – say 1 foot square…. in RGB and then CMYK to see which print looks more vivid from that machine.

JD

It’ll be even "huger" if he outputs to CMYK, which will probably be the

case.

If their running to offset press, it’ll be 4-color…
In 6-color, your refering to a inkjet of some type aren’t you?

n8

Some of these printers are 6 color or more… it’s really best to check

with

the specific printer he intends to use.

I’ve read that it can be better to send the file as RGB, since it will

split

off into some of these machines with a wider gamut of hues… once they’re thrown out when converting to CMYK, they’re gone forever. Often print drivers are optimized for RGB…

Another idea is to send a small version of the pic – say 1 foot square…. in RGB and then CMYK to see which print looks more vivid from that

machine.

JD

It’ll be even "huger" if he outputs to CMYK, which will probably be the

case.

The original post referred to having a 6′ x 8′ final result…. there are machines that print these dimensions for billboards, etc. The ones I’ve seen were at least 6 color units. The output resolution was something like 200 DPI.

This sounds like a one-time-deal for the guy, certainly not worth making plates for an offset press. Even cutting the final dimensions into quarters, there’s no way this would be economical.

here is one of many places that does it.
http://visualmedia.iusm.iu.edu/large-printer.html

In my home town – Calgary – one showed me two machines, one similar to the above with much higher resolution than the other. Both were at least 6 color units. The low-res machine had special inks which had a five -year outdoor guarantee, the other was intended to make hi-res posters for inside stores/restaurants etc.

I have a feeling that sending a CMYK bitmap to either machine would produce muted colors compared to ripping an RGB file, that’s why it’s worth a test to know for future jobs.

JD

Ahh, I should of read the post closer…
=)

n8

The original post referred to having a 6′ x 8′ final result…. there are machines that print these dimensions for billboards, etc. The ones I’ve

seen

were at least 6 color units. The output resolution was something like 200 DPI.

This sounds like a one-time-deal for the guy, certainly not worth making plates for an offset press. Even cutting the final dimensions into

quarters,

there’s no way this would be economical.

here is one of many places that does it.
http://visualmedia.iusm.iu.edu/large-printer.html

In my home town – Calgary – one showed me two machines, one similar to the above with much higher resolution than the other. Both were at least 6

color

units. The low-res machine had special inks which had a five -year outdoor guarantee, the other was intended to make hi-res posters for inside stores/restaurants etc.

I have a feeling that sending a CMYK bitmap to either machine would

produce

muted colors compared to ripping an RGB file, that’s why it’s worth a test to know for future jobs.

JD