I tried to do some research for you and now I'm even more confused.
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Maximum display size of photos is 2048x1536 pixels each.
- from the free account description.
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Your original size images are stored (up to 20 MB) and you can have web-size images of up to 2 MB or 4000 x 3000 pixels per image.
- from teh pro acount description.
I also fond these tidbits.
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Original size images
As a Pro user, your images are uploaded at their original size by default in the Main Uploader and the non-Flash Uploader. A web-size copy is created for display on Photobucket and for linking and sharing when you upload, as well.
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Notes:
When you link to an image, it is the Photobucket web-size image, even if you uploaded that image at its original size (in high resolution).
Your web size image may be the same size as your original image if your upload settings are greater than your image size. For example, if your upload settings are 4000x3000 and your image is 2448 x 3264, the web size image is the same size as the original.