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Helpful answers
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Nov 6, 2011 6:16 PM in response to crabpawsby LarryHN,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
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Nov 6, 2011 6:39 PM in response to LarryHNby crabpaws,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?)
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Nov 6, 2011 6:46 PM in response to crabpawsby LarryHN,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
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Mar 3, 2016 3:55 PM in response to Meg The Dogby Sierra Sky Pilot,Thank you for this simple solution! However, does anyone know, however, the conversion of pip (pixels per inch) to mb? In my Photos app, info about photos is in mb, not pixels. For instance, a photo of a shrub blooming with flowers had this info: Canon PowerShot SD630, 5.8-17.4mm, 2272 × 1704 444 KB, JPEG. Mac Photo (or iPhoto either) don't show information about pixels.
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Mar 3, 2016 5:08 PM in response to Meg The Dogby LarryHN,It is true that you can do that and change the EXIF field entry - however that accomplishes nothing except to change a meaningless EXIF field - the DPI of a print is the answer to a third grade math problem - and nothing in the EXIF files has any effect of this - all you are accomplishing is reducing the quality of the photo by doing one additional totally unnecessary and meaningless PEG conversion - it is the same as writing BMW on the side of your Honda - it does not change anything except mess up the looks of the Honda
LN
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Mar 3, 2016 5:12 PM in response to Sierra Sky Pilotby LarryHN,Pixel dimensions are in the info window in Photos along with the other metadata from the camera - same is true of iPhoto
Right click on one photo and get info - it is all there
LN
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Mar 3, 2016 10:37 PM in response to Sierra Sky Pilotby Terence Devlin,For instance, a photo of a shrub blooming with flowers had this info: Canon PowerShot SD630, 5.8-17.4mm, 2272 × 1704 444 KB, JPEG.
The bit highlighted and underlined are the pixel dimensions of the photograph.
There is no straightforward conversion rate between the pixel dimensions and the size of the file. It depends on the content of the file, the quality of the file and so on.

