DPI problem

KO
Posted By
kelvin_ong_wee_keong
Feb 15, 2009
Views
401
Replies
12
Status
Closed
can adobe give me a copy of dpi table because i want to do a file 36 feet x 11 feet and other i don’t no how to calculate the dpi can adobe give me a copy of photoshop dpi table???

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JP
john_passaneau
Feb 15, 2009
I don’t think that there is such a table. I did a quick Google check and it seems that 70dpi is common for a billboard of the size your looking to do. You should ask the people that is going to print the file what they want. One of the sites I looked at wanted the source file for that large of print to be 300ppi (remember, ppi is not the same as dpi) and 1/12 the finished size. It would be very impracticable to try to send a full size file to the printing company.

John Passaneau
BL
Bob Levine
Feb 15, 2009
70 ppi? I’d be thinking more along the lines of 20-25 ppi tops

Bob
F
Freeagent
Feb 15, 2009
I’ve done banners at that size at 20, as per request of the printer.
B
Buko
Feb 15, 2009
Talk to the printer
JM
John_Mensinger
Feb 16, 2009
Talk to the printer

Right.

And let’s say the printer tells you 20ppi.

Use a multiple to work at a smaller size/higher ppi.

Because your output size is in feet, converting to inches makes it easy, with 12 as your multiple.

So make your work image 36 x 11 INCHES @ 240ppi, (20 x 12).

In 8-bit RGB mode, that’s a manageable 65MB.
F
Freeagent
Feb 16, 2009
Use a multiple to work at a smaller size/higher ppi.

Why? The file size stays the same, so why not have the correct dimensions?
JT
John_T_Smith
Feb 16, 2009
can adobe give me

This is not Adobe support

This is a USER TO USER forum with the space provided by Adobe

Only other USERS post here
P
Phos….
Feb 16, 2009
Only Mostly, other USERS post here

There. Fixed that for ya!

😉 XD
JM
John_Mensinger
Feb 16, 2009
The file size stays the same, so why not have the correct dimensions?

True, of course. But, the OP seemed to be seeking image size/resolution relationship math. Even though it’s not a necessity, a working image at the smaller dimensions can often be beneficial in the context of view management. Depending on the available monitor real estate, a 36 x 11 FOOT image at 100% zoom will be displaying a much smaller portion of its extents than a 36 x 11 INCH image will. And, fitting the entire larger image on screen would require a much smaller zoom level. The smaller working dimensions make managing the view and assessing the effects of operations easier to see and evaluate.
JM
J_Maloney
Feb 16, 2009
36 x 11 FOOT image at 100% zoom will be displaying a much smaller portion of its extents than a 36 x 11 INCH image will

How does that work? I thought all this inch-to-foot stuff was a holdover from a 40-inch limit to artwork? An image with the same pixel dimensions will display the same is PS regardless of it’s print size/resolution setting. Other RIP software might behave differently (which would be interesting to me).
JM
John_Mensinger
Feb 16, 2009
An image with the same pixel dimensions will display the same is PS regardless of it’s print size/resolution setting.

I stand corrected. Apparently, I wasn’t accounting for the difference in resolution.

It’s true: 36 x 11 IN @240ppi looks and behaves exactly the same as 36 x 11 FT @20ppi…in Photoshop.

Sorry if I confused anyone else.
A
Art
Feb 16, 2009
48 foot wide billboard is 576 inches. At 10 dpi, you’d have a 5760×1680 for a 14×48 foot billboard. That’s about a ten meg picture. From a half a block away (or more) that’s plenty.

As Bob says, 20-25 dpi or ppi tops. (20 dpi for the same billboard is an almost 40 meg image.)

wrote in message
I’ve done banners at that size at 20, as per request of the printer.

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