Adobe Lightroom 2.7 exporting issue (says it is exporting at 300dpi but exports at 72dpi)

Question

Hi,
I have lightroom 2.7.
I am a photographer that depends on lightroom. I do a lot of printing from images I export direct form it.
I am trying to export images at 300dpi.  I am selecting 300dpi in the export box under image sizing.  I use mogrify plugin also if that means anything to anyone.
However when I open up these images in photoshop and go to image size it says they are all 72dpi. My printers have also complained that this has happend as well as my wedding supplier. They all say my images are 72dpi.
I have read all the forum responses like getting rid of the minimise embedded metadata check in the box etc and nothing is working.
I am working hundreds of images at a time and therefore can't afford the time to set up an action in photoshop to resize every single image and sit there an hit the play button.
Does anyone have a simple answer to this issue that has proven to have solved the problem or any other non time consuming work around.  Or even a support number for adobe I can call.
It is causing me a huge amount of time loss and stress.
Would be awesome if someone had an answer floating out there.

Answer 1

Bella,
I don't think you've understood my post above. When you export from Lightroom you create JPEG file, a JPEG file does NOT have a DPI measure. You cannot export a file at a certain DPI.
The reason is DPI or Dots Per Inch is a measure of length, inches. A file does not have a length, or a width for that matter. The only meaningful measure for a JPEG file in this context is 'Image Size'. Image size is expressed as pixels wide X pixels high, in the case of your Canon 5616x3744.
Exporting from LR, if you opt to 'Burn Full-Sized JPEG' at 100% then you will get a file of image size 5616x3744. Printed at 300dpi you'll get a print 18.7 inches wide.
If you want a print bigger than that then you have to create more pixels. Software does this by 'making up' new pixels based on the pixels that are already there. Exporting from LR and adjusting the Image Sizing will do it. You can do it from Photoshop. For optimum quality it's best done with some knowledge of the final print size, and print device.
From the sound of things if you supply both parties will full sized JPEG's then you are giving them as much as you can without getting into the murky world of upsizing. The metatdata tag that gives a DPI measure in the file is meaningless, don't let it fool you or the printers.
Hover your mouse over the file (in PC, not suer about Mac) and Windows will show you the image size.
Hope this helps.
Pete