| Author | Thread |
|
|
04/12/2005 08:55:30 PM · #1 |
Why do digital cameras take JPEG images at 72ppi? I'm assuming it's because of the file size.
Once I bring the image into PS, will increasing the ppi to 200 have any affect on the image when submitting for a print? I adjusted a few to 200ppi and kept the size the same as the original file. The picture looks the same. I read that 200ppi is the setting for true photo quality prints. Is this accurate?
Logically it would make sense that the more pixels per inch the better the picture. Right?
What do most of you do? Do you increase the ppi? or do you leave it as is?
Any particular methods on preparing pictures for printing? |
|
|
|
04/12/2005 09:46:13 PM · #2 |
All you need to do is load a picture and goto EDIT > Preferences > Units & Rulers and under 'Document Resolution' set screen resolution to 72 pixels/inch and click OK. It will then bring up all your photographs at 72 ppi. which is the best for the web.
|
|
|
|
04/12/2005 09:53:57 PM · #3 |
ppi has absolutely nothing to do with anything except when an image is printed. When you think of image size, think of its dimension in pixels, like 3072x2048 is the native size for the 300D. When you do print an image, the size of the image is just the number of pixels divided by the ppi. Our example image, printed at 100 ppi, would be 30.72 inches wide (3072/100) and 20.48 inches high. At 300 ppi it would be 10.24x6.27 inches.
When you change the ppi in Photoshop, if you don't want to change the actual (pixel) size of the image, uncheck the "resample" box before changing the setting.
|
|
|
|
04/12/2005 10:14:57 PM · #4 |
Originally posted by kirbic:
ppi has absolutely nothing to do with anything except when an image is printed. When you think of image size, think of its dimension in pixels, like 3072x2048 is the native size for the 300D. When you do print an image, the size of the image is just the number of pixels divided by the ppi. Our example image, printed at 100 ppi, would be 30.72 inches wide (3072/100) and 20.48 inches high. At 300 ppi it would be 10.24x6.27 inches.
When you change the ppi in Photoshop, if you don't want to change the actual (pixel) size of the image, uncheck the "resample" box before changing the setting. |
Will changing the ppi from 72 to 300 make the print come out better? Again, leaving the actual pixel size of the image alone. |
|
|
|
04/12/2005 10:21:24 PM · #5 |
Originally posted by krazyivan:
Originally posted by kirbic:
ppi has absolutely nothing to do with anything except when an image is printed. When you think of image size, think of its dimension in pixels, like 3072x2048 is the native size for the 300D. When you do print an image, the size of the image is just the number of pixels divided by the ppi. Our example image, printed at 100 ppi, would be 30.72 inches wide (3072/100) and 20.48 inches high. At 300 ppi it would be 10.24x6.27 inches.
When you change the ppi in Photoshop, if you don't want to change the actual (pixel) size of the image, uncheck the "resample" box before changing the setting. |
Will changing the ppi from 72 to 300 make the print come out better? Again, leaving the actual pixel size of the image alone. |
To make sure we are talking about the same thing. I use PS/CS it has a setting for 'screen' resolution - that was what I was talking about in my previous post and it has print resolution. Screen resolution I have set at 72 and print resolution at 300.
Yes 300 print resolution is the best quality.
Message edited by author 2005-04-12 22:22:54.
|
|
|
|
04/12/2005 10:21:39 PM · #6 |
Originally posted by krazyivan:
Will changing the ppi from 72 to 300 make the print come out better? Again, leaving the actual pixel size of the image alone. |
You are still confused ... there is no changing the "actual pixel size" unless you resample.
If you take a picture which is 600 pixels wide, you can print it six inches wide at 100 ppi, or two inches wide at 300 ppi. Exactly the same 600 pixels, printed over a larger or smaller space.
Which is "better" depends on your display needs. |
|
|
|
04/12/2005 10:31:19 PM · #7 |
If you are using your 20D your max. resolution is 3504 x 2336. You can divide each side H&W by the resolution you want and that will be the size picture you can achieve without resampling. And we know that the more ppi the better so 3504 x 2336 @ 300ppi would give you an image size of 12 x 8 inches. If you go with 150ppi then you could get a picture size of 24 x 16 inches. I used 300 and 150ppi because that is what is used on DPCPrints.
|
|
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 09/16/2025 09:55:13 AM EDT.
