8 Replies Latest reply: Oct 8, 2008 8:44 PM by jumpnjehozaphat
ASIGinVT Level 1 Level 1 (0 points)
I work for a small church and we are running into the issue of our photos not being a high enough resolution for printed materials. Is there a way to check and to change the resolution to at least 300dpi? Many thanks in advance!

Mac OS X (10.5.4)
  • TopoTone Level 4 Level 4 (1,255 points)
    I have found that you cannot increase your resolution relative to the files image quality. That is; if you take an original 72dpi image and make it 300 dpi, you will not get the result of that image being originally 300 dpi., since that information is not present in the original. I do remember an application that would do something like that, but I've forgotten what it's called. You can do a search for it...see if anything comes up.

    Anyway, you can always go down in resolution, but going up will not magically create resolution that wasn't there in the first place. Hope this helps. BTW, you'd have to do that in something like Photoshop or Graphic Converter.
  • Terence Devlin Level 10 Level 10 (134,600 points)
    Welcome to the Apple Discussions.

    If you want to change the resolution, then change the dimensions.

    Your photo has X number of pixels. Spread over a length x breadth of - say - 2 inches by 3 inches you will have a higher dpi (dots per inch) than the same number of pixels spread over a length x breadth of 4 x 6 inches.

    What you cannot do without losing quality is to increase the number of pixels.

    This site explains it quite well:



  • Keith Barkley Level 5 Level 5 (5,705 points)
    What camera are you using and what image size (in pixels) are you shooting?

    You have to start with enough resolution!

    If you are using video screen captures, you may be out of luck, since they are naturally pretty low resolution.
  • jumpnjehozaphat Level 1 Level 1 (0 points)
    I'm running into similar issues. I am shooting with a Nikon D80 and info given by iPhoto states that my resolution is 3,872 x 2,592, which is more than sufficient for a 5x7 or even an 8x10. When I burn images onto a CD to take to a developer, does iPhoto "downsize" my native resolution on the photos? Because when I got my pictures back, they were horrible.

    Any and all help is greatly appreciated.
  • Old Toad Level 10 Level 10 (128,940 points)
    How do you burn the photos to the CD? You should first crop to the size you want printed and then export to a folder on the desktop using the File->Export->File Export with the following settings:

    JPEG Quailty=Maximum
    Size=Full Size

    as seen here. Then burn the folder of files to the CD.

    TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto (iPhoto.Library for iPhoto 5 and earlier) database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.

    I've created an Automator workflow application (requires Tiger or later), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 6 and 7 libraries and Tiger and Leopard. Just put the application in the Dock and click on it whenever you want to backup the dB file. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

    Note: There's now an Automator backup application for iPhoto 5 that will work with Tiger or Leopard.
  • LarryHN Level 9 Level 9 (68,955 points)
    Jump n jehozaphat

    Welcome to the Apple user discussion forum

    This is a different question and should be in a new thread - I've requested that the host do that but don't know if they can or will

    You case is simple - stop going directly into the iPhoto library to get photos - you are getting the wrong ones AND you are risking corrupting your library

    Export the photos you want to print to a desktop folder, burn it to CD or upload from there to your photo processor and everything will be fine - and you will not take a chance on corrupting your library and losing data

    There are many ways to access your photos correctly - and NONE of them involve entering the iPhoto library directly - click here for a discussion on accessing your photos.


    Message was edited by: LarryHN
  • LarryHN Level 9 Level 9 (68,955 points)

    Welcome to the Apple user discussion forums

    I work for a small church and we are running into the issue of our photos not being a high enough resolution for printed materials. Is there a way to check and to change the resolution to at least 300dpi? Many thanks in advance!

    As mentioned DPI is meaningless until you print - what is critical is the pixel dimension of the digital photo - which starts with the camera and its settings

    to print a 300 dpi print for a 4 x 6 photo you need to have a 1200 x 1800 photo
    for 5 x 7 you need 1500 x 2100
    for 8 x 10 you need 2400 x 3000


    for most church work 150 dpi prints would be very acceptable so as long as you have a 1200 x 1500 image (roughly a 2 megapixel camera) you should be able to print up to 8 x 10 just fine

    The other issue is how are you accessing your photos? You should be exporting them or using one of the access methods described in this link.


    Message was edited by: LarryHN
  • jumpnjehozaphat Level 1 Level 1 (0 points)
    I apologize about thread jacking.. Thank you guys for all help. I will try my best to ask questions in the proper format.