Re: file size for print - read this Naomi 2004-08-11 - By patrick210hd
Back
Okay, I see this every now and then on various forums. I have a 54"
printer in my shop and routinely print 3D images at "large" sizes. I
also do setups for billboards and backdrops which can be up to 40
feet x 25 feet. So, the definition of large is relative to what you
are trying to accomplish. If you are wanting poster size, say 24" x
36" that will be viewed closeup, then 300 ppi is great and 150 to
200 ppi is adequate. This translates to 7,200 pixels x 10,800
pixels or 233 megs @ 300 ppi (uncompressed). That size would be for
high end, really sharp photographic images. By the way images
are "ppi" ( pixels per inch) and printers print in "dpi" ( dots per
inch ). Sometimes the two are used interchangeably when they really
shouldn't be. 200 ppi is really fine for most poster size prints and
150 will work for advertising and signs. For larger images, such as
wall murals and backdrops which are viewed form further away,
resolutions as low as 50 ppi is sufficient. In any event, I always
give the printer as much as I can. Unless your specific image can
stand a lot of compression, I usually send a CD through the mail for
really large files. That 35 meg file you have will look fine at 24"
x 36", also the media will have an effect. Decal material or canvas
is not as sharp as photo paper. 3D images specifically also tend
print out darker and with less contrast than they appear on screen,
I always do some color correction before printing. The printer can
use the smaller size at reall large ppi because his printer can
scale up the image. I hope this clears things up a little, please
feel free to ask for more info.
Good luck, Patrick Tuten
--- In Carrara@(protected), "Naomi Sullivan" <cathlametw@(protected)>
wrote:
>
> I'm having a bit of a problem with getting the picture I created
in
> Carrara to the guy who wants to print it out LARGE. First, I
converted
> it to a jpg at 150 dpi (using Irfanview). That file was 35 meg.
He's
> evidently on dial up and had trouble downloading it, and once done
> couldn't even find it on his hard drive. LOL
>
> So, he then told me that the printer company he uses really only
needs a
> TIF format of 8" by 10" by 700 dpi in order to print out large
with no
> problem. I'm hoping there's a communication problem between us,
cause
> that file size would be 107 meg!!! So, I've written back to him
asking
> if what he really meant was 800 X 1000 (pixels) by 700 ppi? That
file
> would only be around 2.2 meg.
>
> My question to those in the know, is will that last setting hold
up for
> a rather large printout? I initially rendered at 9000 wide by
6750
> (yeah I know that's not 8 x 10 ratio, but it's what the scene is
set for
> and he knows that). So, in Irfanview, can I resample that render
to
> 1000 x 750 pixels by 700 dpi, and have that work ok, or do I need
to
> rerender the scene, and if so - at what setting?
>
> This is turning out to be waaaay more work than I bargained for.
LOL
>
> --
> Naomi
> 2D or not 3D
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