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The image is 'scaled' to show 72 pixels per inch on screen - so a 300 DPI image appears on screen to be gargantuan. Show a JPG in safari for instance and it simply ignores the DPI setting, assuming it is for print only.
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Screen: 'DPI' is set by the program you view it with, and the zoom level at which you are looking at the image. You can set this in Photoshop or other graphic program (e.g., Graphic Converter) This parameter tells printers to use the DPI of the image to stuff points of color in. Print: 'DPI' for the printing of source images is 'set' by a parameter in the file itself.
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There is some confusion about so-called DPI because there are two media: print and screen. Update: iPhoto6 resolved this issue no need to use this hint if you've upgraded. If you want to edit the plist file and you're in 10.4, you'll either have to use Apple's Property List Editor (part of the Developer Tools) or convert the binary plist to XML first via the Terminal ( plutil -convert xml1 filename), and remember to convert it back to binary ( binary1) when you're done - and remember to quit iPhoto prior to editing the plist file! I think I'll wait on the edit until reading some of the comments.] I'm not sure why Apple would have it set this way, nor if changing it will really improve the printd quality - isn't it also dependent on the resolution of the source images? Anyone with a better understanding of DPI and printing, please leave a comment! [ robg adds: I haven't tested this one, but it's evident in the plist file that the DPI setting for the medium and large books is 150DPI, versus 300DPI for the small books. This will dramatically increase the size of the file sent to Apple, but should make the results look a lot better. The solution? Edit ~/Library -> Preferences -> and change both BookTargetImageDPI and BookTargetMediumImageDPI to 300.000000. Consider the fact that at 130dpi, iPhoto warns you that the image will not look good printed, and you can see the problem. The small books are at 300dpi, which is much more suitable for printing.
Iphoto printer pdf#
When you upload a medium or large book to Apple, iPhoto creates a PDF file with images that are only 150dpi. When I received the book, the prints were mediocre, and that's being kind. Having had a small book made through iPhoto earlier in the year and being really happy with the results, I decided to order one of the large books made from pictures of a recent vacation.