DPI / Image size

Dear All
I am big Aperture user, but a bit of a technical novice I'm afraid - at least when it comes to DPI....
I take RAWs on my 5d Mk 2. Image files are procesed in Aperture / Photoshop. I then export JPEGS for distribution (Apple TV, prints for friends and family, burning to DVD etc)
I export full size JPEGS (image sizes can be about 25meg).
My question is....what DPI should I have Aperture set on to ensure top quality prints? I normally print 9 x 6, but would want the ability to increase sizes as required.
Is there a relationship / optimum setting between DPI and image size? Should I alter this if the JPEG is for different uses (priniting, burning to DVD etc).
Many thanks for any help
Paul

Paul,
Photos from your camera and in Aperture have a dimension in pixels -- your camera can produce image files of 5,616 x 3,744 pixels. It is only when setting a resolution that ppi (pixels per inch) comes into play -- the total number of pixels is independent of that resolution. Printers reference quality as dpi, and this does not directly reference any ppi, but of course the ppi may limit what dpi the printer can actually apply. When printing from Aperture the pixels (if cropped, those remaining) will all be used and the ppi will automatically be adjusted to fit the paper size you are intending to use. If you are printing from Aperture, there is no reason to convert to a JPEG to use for that purpose.
If you do convert and export a JPEG, then if at original size, the full pixel dimension of the image will be maintained, and if later printing in Photoshop, say, then it will adjust to fit the paper. A JPEG to use with a DVD slideshow will have to be changed to use the pixel dimension that fits the media, but some software will do that behind the scenes, if exporting from Aperture solely for that purpose you might want to customize that to fit within something like 720 x 720, 1024 x 1024, 640 x 640, etc. When this takes place the total pixels are resampled, and the image is rescaled to be represented by fewer pixels. Aperture does seem to use PPI and DPI interchangeably, btw, but see:
http://www.tildefrugal.net/photo/dpi.php
and
http://en.wikipedia.org/wiki/Pixel_density
Ernie
Message was edited by: Ernie Stamper

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You don't need to set the image size as such. The image prints on the page according to two sets of criteria:
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Image size and resolution question.

Is an image at W 48.667 x H 32.444 inches at 72 res the same as an image that I could convert in photoshop to 300 res and then the with "Resample Image" clicked off would be W 11.68 x H 7.78 at 300 res for printing purposes? I'm asking this questions because after exporting 200 images from Lightroom 1.4, putting them into an wedding album I realized the images were not at 300 res but the first size listed above. I'm trying not to have to rebatch and have to put them back into the album. I sent the question to NAPP and got this back"
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Bob's question is a common one. And one of the first that most of us struggled to understand. Let's see if I can shed some light to help clarify the matter.
o The image starts out with a given number of pixels from the camera, scanner, or whatever was its source. The resolution only matters when it comes time to print the image.
72 dpi was once a common resolution for displaying on a computer monitor. Today 90 dpi is more common monitor resolution.
o Let's assume that the image is 3504 x 2336 pixels (which I got from his size @ 72 dpi).
o In "image size", if you do _not_ have 'resample image' checked, all you are doing is _rescaling the image. The image resolution is whatever you enter ...
For example, if you enter 360 dpi -- the native printing resolution of many Epson printers -- you get a print size of 9.733 x 6.489 inches
o Let's say you want to print this image at 360 dpi in portrait on 13 x 19 inch paper with a one inch border on the sides. That would make the short dimension of the image 11 inches and the long would work out to 16.5.
To do that you need to _resample_ the image to change the size. More pixels will be made. The resolution stays at 360 dpi. So check the 'resample image' box.
After resampling to get the print size and resolution you want, the pixel dimension goes to 5960 x 3960 (from 3504 x 2336). Those new pixels came at a price, but that is a matter for another thread and a lot of personal bias.
Hope that helped.
P.S. The answer to your question, Bob, is yes. With resample off in PhotoShop, your original images should have gone to 11.68 x 7.787 inches @300 dpi.
In looking at the rest of your original post, it seems that the export didn't work the way that you wanted. Do I read right that the images turned out to be 11.68 x 7.787 @ 72 dpi? Can't help with that as I don't do Lightroom.

DPI / Image size

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