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from the rules:
Image size must be at least as large as the existing online covers. If you don't have a premium registration, you will be unable to verify this. Therefore, submit only images you have personally scanned at 100 DPI or higher.
If you scan images for your personal database at a quality that are higher than 100 DPI, you may still submit them. If accepted, they will automatically be downsized for inclusion in the main database.

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Here's an PM I sent someone when they asked me for tips on contributing images.

First thing to note that when contributing scans, bigger is NOT better.  Any image that is larger than 500x700 pixels and 200,000 bytes (195k) will be recompressed at a high compression ratio.  Pasting an image into DVDP also will recompress it unfortunately.

So when you have your scan all cleaned up and ready to submit, resize it down so it doesn't exceed 500x700 pixels.  After resizing it down, sharpen the image as shrinking tends to introduce a slight blur.  Save it as a JPeg file at the highest compression ratio and examine the file size.  If it is over 195k, re-save the image at the next lowest compression ratio and repeat until the file size is less than or equal to 195k.  Note that if it is 195k, right-click on the file to view the properties and ensure that it's not over 200,000 bytes.

Now that you have the scan the way you want it, you'll want to name the file the same as what DVDP uses.  The easiest way to find the file name is to edit the cover in DVDP and make a crop on the cover.  Then when you view the image directory, you can sort by last modified date and pick it out.  For example, the front cover for the R1 version of Highlander is named "013131143195f.jpg".  The "f" stands for the front, "b" for the back.  Once you rename your scans to match, copy them into the DVDP image directory located at "My Documents\DVD Profiler\Databases\Default\Images" (default may be different if you named your database).

Then you're ready to contribute and have an awesome looking scan.

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Quoting Borg561:

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Doh! Never thought of looking in the rules as I'd never contributed images before (my old scanner was quite old didn't work well with Windows XP).  Looks like I'll go for something in the 300-400 range and let them be downsized as needed.

Invelos will resize any image that you submit that is larger than either 500 pixels wide or 700 pixels tall. To achieve the best results for the online database, size the image yourself, regardless of DPI, to no more than 500x700 before you submit.

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By the way, the maximum DPI at which your scanner is able to scan is its specified optical resolution. Any resolution higher than that is simply software interpolation by the scanner software...

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So, how do you figure the optical resolution for a scanner?  The box and documentation for my scanner (an HP Photosmart C3180 All-in-One) list the optical resolution as 1200x2400 dpi.  Is 1200 the max, or is it 2400, or a some product of the two?