Problem exporting image to specific file size

I've had some professional images shot and I can see from the file size in Aperture that they range from 13 - 73 mb. I need to submit them as 72dpi and 300dpi files and they must be between 1 & 3 mb in size.
I'm having no problems in exporting them at the correct dpi but the file sizes come out between 451kb and 1.8kb: 3 of the 6 images are too small, ie under 1mb.
What I'm doing is 'export version', then choosing the preset option of 'jpeg original size', editing it to the dpi I want, setting the image quality at a max of 12.
How can I get these file sizes to be bigger?
Thanks, and please help me quickly because I've a submission deadline approaching!

Well that's interesting Ernie. I did as you said, but also exported an image while I had the settings at 4288 x 4288 pixels. The resultant file size at that setting is 1.4MB. The file size when I went back to 'original size' is 795KB, exactly the same as before.
So I thought - if I can go above original size in that way, then can I alter the % to be over 100? I tried at 150%, which it accepted, and I've now got a file size of 1.3MB.
So I guess I've got what I wanted - not that I really understand it, because 'original size' clearly isn't original size at all!
Sorry Leonie - I didn't answer your question - they haven't given me a specification for pixel size as in 4288 x 4288: only 300 & 72dpi, a file size of 1-3MB, and a they must be JPGs.
And thanks for your help Frank - I've tried starting out with JPGs and with TIFFs as the photographer supplied me with both. I'd cropped some of the images but not others. I appreciate you offer of having a go with my images, but I think that - as I can go to over 100% - I've got it sorted now! Just hope there's no deterioration in image quality.
Many thanks everyone!

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http://joedasilva.com/blog/?p=32
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quote:
Originally posted by:
jdldn
Ive read this tutorial;
http://joedasilva.com/blog/?p=32
and ive just found out that if you scale an image smaller,
the file size is permanently decreased, and enlarging the image
again will make it pixalated. If im working with images and I want
a lot of freedom to play around with the scaling, do I need to
convert them all to grafics?
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at the display resolution when I export them, but maintain there
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thanks
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you feel a need to refresh an object that you've resized too many
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Hi Geoff
windows 7 buisness ed.
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I'm having trouble exporting files at the mb size I want. I go to edits and set everything on the maximum export size and quality, so in effect a 10mb file gets slimmed down to about half at 5mb and I canot figure why this happens!
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Problem exporting image to specific file size

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