4 Replies Latest reply: Nov 6, 2011 6:46 PM by LarryHN
crabpaws Level 1 Level 1 (0 points)

Hi -- I had a slide scanned to be printed (yes, printed) in a 10.8" x 14.4" size by a process that requires 300 ppi.

 

I imported the scanned jpeg into iPhoto at 1500 ppi, but I can't seem to be able to edit it and export it at anything but 72 ppi.

 

How can I export my photo with changes from iPhoto at 300 ppi?

 

I know this is an existential question, but why does this have to be so hard?

 

(No, I don't have Photoshop or Photoshop Elements.)


Mac mini, Mac OS X (10.6.8)
  • LarryHN Level 9 Level 9 (66,995 points)

    DPI - Dots per inch) is meaningless until you actually print - while there is a DPI field in a digital photo it is meaningless - the DPI is determined by the pixel size of the photo and the print size - to print a 10.8 x 14.4 image at 300 dpi you need a digital photo that is 3240x4320 pixels - export as that size or larger and your print will be 300 DPI

     

    See  The Myth of DPI for additional information.

     

    LN

  • crabpaws Level 1 Level 1 (0 points)

    Thank you for attempting an answer.

     

    I believe I mentioned this was for print (yes, print) and the process requires 300 ppi. No myth there.

     

    Prior to posting here, I'd already done as you suggested. The online print system still will not accept my file. When I look at it in Preview, it shows 72 ppi.

     

    So I followed your instructions, exporting from iPhoto at Custom size Max width 4320 pixels, and went through the process again. The result is the same. My image has been rejected, and it reads 72 ppi in Preview.

     

    Any other suggestions?

     

    (And why doesn't iPhoto show ppi as part of Info?)

  • Meg The Dog Level 6 Level 6 (10,545 points)

    Export your photo to the desktop.

    Open your photo in the Preview.app.

    In Preview, go Tools > Adjust Size . . .

    PreviewScreenSnapz001.jpg

     

    Then set the DPI to 300:

     

    PreviewScreenSnapz002.jpg

     

    Click OK,

    And then Save the image.

     

    MtD

  • LarryHN Level 9 Level 9 (66,995 points)
    Any other suggestions?

    Contact CS for the print vendor - they have a problem  - without a graphic editor (like Preview) or an EXIF editor you can not change the DPI setting

     

    (And why doesn't iPhoto show ppi as part of Info?)

     

    Because

     

    DPI - Dots per inch) is meaningless until you actually print - while there is a DPI field in a digital photo it is meaningless

    Digital photos files simpy do not have inches associated  with them - they only have dots (pixels) - no inches

     

    See  The Myth of DPI for additional information.

     

    LN