?
Solved

why does photoshop 7 open a pdf file in 72 dpi when it was saved as 300 ppi and does this 72 now effect the printing quality?

Posted on 2007-11-19
4
Medium Priority
?
795 Views
Last Modified: 2009-07-18
why does photoshop 7 open a pdf file or a psd file in 72 dpi when it was saved as 300 ppi and does this 72 now effect the printing quality? I need to keep the quality level high enough for printing, and so I need to know 1. why does photoshop 7 change the dpi to 72
2. if I just change the dpi back to 300 will it print ok?
0
Comment
Question by:MastersConnection
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 43

Accepted Solution

by:
Chris Stanyon earned 252 total points
ID: 20320895
When you open a PDF in Photoshop it prompts you for the resolution. Just set it to 300 dpi and open it.
0
 
LVL 22

Assisted Solution

by:fredshovel
fredshovel earned 248 total points
ID: 20331056
<if I just change the dpi back to 300 will it print ok?> The short answer is yes.
Despite what you hear 300dpi (dots per inch or pixels per inch [same thing]) is still the standard for printing in the major publishing houses -- it's perceived to be the maximum detail that the human eye can perceive.
The dpi is really a 'print reference' -- it's a juggle between how many pixels you have in total and what size your image will print at.
Here's a good way to see all this without having to read technical explanations.
Just load an image into Photoshop and click Image / resize . Check the 'constrain proportions' box but UNTICK the 'Resample Image' box.
Now you can play with the dpi -- notice that everytime you change it, it changes the width and height of the 'print size' or 'document size' of the image. So with a 72 dpi  high resolution image you're going to have this huge blurry image (because it's stretching the pixels over a single page at only 72dpi) and the whole  image now won't even fit on the page -- so it crops it. You can see all this happening by additionally pressing 'print preview'.
But because, if you're printing, you always want 300dpi, it's a very good way to see exactly what size your image will print at using the full 300dpi.
Say you had a shot that you wanted for a 'cover shot' for a magazine, but you weren't sure if you had enough pixels in the shot to 'cover the cover' -- you simply select 300dpi and take a look at the print preview. The guys in the mag pre-press are always very reluctant to blow up a shot that won't go over the whole cover at 300dpi, because they have to stretch the pixels -- and then it starts to blur.
Whew!

Footnote:
You probably know that 72 dpi is a computer monitor standard -- ok for web pages.

0
 
LVL 22

Expert Comment

by:fredshovel
ID: 24843328
Yes Bong no comment was added for 21 days; in fact no comment has been added for 601 days, or
one year 7 months and 23 days. Good to look back anyway.
0

Featured Post

Enroll in August's Course of the Month

August's CompTIA IT Fundamentals course includes 19 hours of basic computer principle modules and prepares you for the certification exam. It's free for Premium Members, Team Accounts, and Qualified Experts!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I. Introduction In a previous article (http://www.experts-exchange.com/Web_Development/Document_Imaging/A_6537-PaperPort-Upgrade-How-to-download-and-install-updated-versions-of-PaperPort-11-and-12.html) (now deprecated), I discussed how to upgrad…
This article was inspired by a question here at Experts Exchange (http://www.experts-exchange.com/Software/Photos_Graphics/Images_and_Photos/Q_28629170.html). The requirements stated in that question are (1) reduce the file size of a large number of…
Make a selection using the pen tool to trace the selection. Then alter the color of the selection by using the color balance option in Adobe Photoshop.
I designed this idea while studying technology in the classroom.  This is a semester long project.  Students are asked to take photographs on a specific topic which they find meaningful, it can be a place or situation such as travel or homelessness.…
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question