Poster dpi

what is the minimum dpi you would use for a poster about one metre tall by
70cm?
The 6mp sample images I have seen seem to be sized at 72dpi and are around
this size.
Can you see pixels easily at this resolution? If so what is an ideal dpi?
I'm learning.
cheers

 

Most wide format inkjet printers will accept 180 dpi images and produce
usable prints. There is a process called interpolation which is used to
"enlarge" digital images for printing. Most wide format print services,
prefer to enlarge the image themselves before making a print. A print
"management" program which will produce very pleasant results is called
"Qimage".

 

For posters, not as much as you'd think.....especially when you go
big.....we use a rule of thumb here......up to 1m2, 100dpi is more than OK
and more than 150 is pretty much always a waste of pixels.



That's for posters.


Pixels are just like people....it's the quality, rather than the quantity,
that is important.






Warmingup

 

Usually 100dpi is sufficient for poster work off an inkjet printer. The
rip program takes care of that.

printed to RA paper lambada printer can go to 400dpi.

 

Hi Jasen,

To work out your requirements, you need to go back to first principles:
How large is the image (you've told us that)?
At what distance will it be viewed?
What are the viewing conditions (eg lighting and viewer's acuity at the
viewing distance)?

Depending on the answer to these, the answer could be anything from 600dpi
right down to 1dpi or less!

You can probably work it out for yourself, knowing that the accepted acuity
of a normal person under normal conditions is sufficient to allow them to
resolve detail down to about 1 arcminute.

Cheers

 

thank you all for that.
cheers
Jasen