Exporting from iPhoto - 8 x 10 prints - image inconsistencies

My other half and I are relatively new to digital photography - but we're in something of a bind.
We looking for several dozen 8 x 10 prints (for an exhibition) from images stored in our iPhoto library. We'll be supplying them on disc to a photography bureau for printing. We did some sample 8 x 10s on our own printer, and were dismayed by how the image resolution varies from image to image; some look more pixellated than others. I'm wondering whether this is because of something we've done in iPhoto, since (as I understand it) JPEG resolution diminishes if photos are edited in any way. To my knowledge, we haven't edited the images; they've just sat in the library - although we've copied and exported many of them.
It's making me wonder whether iPhoto is the most suitable application for this kind of work, since it holds everything in the space-friendly JPEG format rather than their original chunky size.
I'd be really grateful for answers to any or all of the following:
1. What activities in iPhoto might have caused the quality of our original JPEGs to have deteriorated, and is there any way of checking this? And can the photos in question be "retouched" in any way? I have access to Photoshop 7, if that's of any help.
2. What format would be the best for exporting the images for the photography bureau (TIFF, presumably?) and are there any tricks or traps to be aware of? I've exported from iPhoto dozens of times, but never in such quantity.
3. In the future, if we want to make larger prints from our digital images, should we be looking to download in RAW format rather than JPEG (the only two formats our camera, a Canon EOS10D, seems to support) - and use an application other than iPhoto? Or would upgrading to iPhoto 6 help us in any way.
Many thanks.

Hi, David.
1. What activities in iPhoto might have caused the quality of our original JPEGs to have deteriorated, and is there any way of checking this? And can the photos in question be "retouched" in any way? I have access to Photoshop 7, if that's of any help.
Cropping, perhaps more than anything else, because it reduces the actual number of pixels in the image. Any sort of editing or manipulation followed by saving, when the file is in JPEG format. Every time you save any new change to a JPEG image, the image is re-compressed and further degraded.
If you have your camera save your images as JPEGs, re-save them as uncompressed TIFFS or PSDs as soon as you get them onto your Mac. Do all your editing and manipulating in TIFF, PSD, or some other uncompressed format. You will still have the original JPEG compression artifacts in them, but at least you won't be adding a new layer of artifacts and blurring with every change you save. For best results, shoot all your important images in RAW format instead of JPEG, so they are never compressed at all.
2. What format would be the best for exporting the images for the photography bureau...?
Ask the bureau what format they recommend or prefer. If they can handle .psd files, that format would maximize your own control.
If you have Photoshop 7, there may be no good reason for you to use iPhoto at all.

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Welcome to the Apple user to user assistance forums
If the pictures are in 4x3 format, exporting them using the "Custom" size option and specifying 1024 as the maximum pixels results in nice 1024 x 768 photos that fill the screen on most projectors. This is good.
The exported photos are also at 72 pixels/inch. This is OK for onscreen display, but not so good for printing.
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Oddly, the results are the SAME (1024 x 768, 72 pixels/inch) whether one specifies Low, Med, High or Max quality in the iPhoto export panel -- though the file sizes ARE different (higher quality = larger sizes). (I used Photoshop Elements to identify the sizes of the exported photos).
What's odd? you said export with the largest dimension 1024 - that occurred just as you specified - what would be odd would be that the export were different form your specification
What gives? I would have thought higher quality files would have been associated with higher resolution (more pixels/inch) but this doesn't seem to be the case, and I don't understand why the file sizes are larger.
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Exporting from iPhoto - 8 x 10 prints - image inconsistencies

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